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MO Cosmetology practice questions

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Question 1Scientific Concepts

Which layer of the skin contains the hair follicles, sebaceous glands, and sweat glands that cosmetologists work with during services?

  1. Dermis Correct answer.
  2. Subcutaneous layer
  3. Stratum corneum
  4. Epidermis

Explanation

The dermis is the middle layer of the skin and houses hair follicles, sebaceous glands, sweat glands, and nerve endings. The epidermis is the thin outer layer, and the subcutaneous layer is the deepest fatty layer. Understanding this location matters because many salon services interact with structures rooted in the dermis.

Question 2Scientific Concepts

A client's hair has a pH of about 4.5. Which description of the hair and scalp is most accurate?

  1. Strongly acidic and prone to damage
  2. Slightly acidic, favoring a compact cuticle Correct answer.
  3. Neutral and chemically inert
  4. Strongly alkaline and prone to cuticle lifting

Explanation

Hair and scalp naturally sit in the slightly acidic range of roughly pH 4.5 to 5.5, which helps keep the cuticle compact and smooth. Alkaline products can swell the hair and lift the cuticle, while strongly acidic environments are not the natural state. Matching product pH to this range supports hair health.

Question 3Scientific Concepts

Which type of bond in the hair is broken by a chemical relaxer and then reformed in its new shape during neutralization?

  1. Hydrogen bond
  2. Disulfide bond Correct answer.
  3. Salt bond
  4. Peptide bond

Explanation

Relaxers and permanent waves break disulfide bonds, which are strong bonds between cysteine amino acids in the cortex. Neutralizer then rebuilds these bonds in the new configuration to lock in shape. Hydrogen and salt bonds are weaker and are broken by water or pH shifts, not by restructuring chemistry.

Question 4Scientific Concepts

During the anagen phase of the hair growth cycle, what is occurring?

  1. The follicle is resting and the hair is shedding
  2. The follicle is actively producing new hair cells Correct answer.
  3. The sebaceous gland is dormant
  4. The hair is detaching from the papilla

Explanation

Anagen is the active growth phase, when cells in the hair bulb divide and build the hair shaft. Catagen is a transitional phase and telogen is the resting phase that ends in shedding. Knowing the phases helps explain unusual shedding or slow growth to clients.

Question 5Scientific Concepts

Which muscle causes goose bumps and is attached to the base of the hair follicle?

  1. Platysma
  2. Masseter
  3. Arrector pili Correct answer.
  4. Orbicularis oculi

Explanation

The arrector pili is a tiny smooth muscle attached to the follicle that contracts in response to cold or emotion, producing goose bumps. The other listed muscles are facial or jaw muscles unrelated to the follicle. Recognizing this structure helps explain why hair stands up during scalp treatments or cold exposure.

Question 6Scientific Concepts

A client with a round face shape wants a style that creates the illusion of length. Which design choice best supports that goal?

  1. Volume built at the sides near the ears
  2. A chin-length bob that flares outward
  3. Height at the crown with a narrow silhouette Correct answer.
  4. A wide, blunt fringe straight across the forehead

Explanation

Adding height at the crown and keeping the silhouette narrow draws the eye vertically, which makes a round face appear longer. Width at the sides or a flared bob adds horizontal emphasis and accentuates roundness. Principles of hair design use line and volume to balance facial shape.

Question 7Scientific Concepts

Which color theory relationship describes yellow and violet?

  1. Monochromatic colors
  2. Tertiary colors
  3. Analogous colors
  4. Complementary colors Correct answer.

Explanation

Yellow and violet sit opposite each other on the color wheel, making them complementary colors. Complementary pairs neutralize each other, which is why violet shampoo reduces yellow tones in blonde or gray hair. Analogous colors are neighbors on the wheel, and monochromatic refers to one hue.

Question 8Scientific Concepts

In haircoloring, what does the developer (hydrogen peroxide) primarily do?

  1. Deposit pigment into the cortex
  2. Lighten natural pigment and activate the color Correct answer.
  3. Adjust the fragrance of the product
  4. Seal the cuticle after processing

Explanation

Developer supplies oxygen that lightens natural melanin and activates the dye intermediates so they form color inside the cortex. Its strength, measured in volume, controls how much lift occurs. The dye, not the developer, provides the deposited pigment.

Question 9Scientific Concepts

A patch test is performed before a color service. What is its main purpose?

  1. To determine processing time
  2. To measure the porosity of the hair
  3. To predict the final color result
  4. To detect an allergic reaction to the product Correct answer.

Explanation

A patch test checks whether a client is allergic or sensitized to an ingredient such as PPD in hair color. It is applied to a small area of skin and observed for a reaction before the full service. It does not predict color outcome or measure porosity.

Question 10Scientific Concepts

Which statement correctly describes the difference between a strand test and a patch test?

  1. Both are done on the scalp
  2. A strand test predicts result on hair; a patch test checks skin sensitivity Correct answer.
  3. A strand test is required only for perms
  4. A patch test is done on wet hair only

Explanation

A strand test is performed on a small cutting of hair to preview timing and outcome, while a patch test is applied to skin to screen for allergic reaction. The two serve different safety and prediction purposes and are not interchangeable. Both are standard professional precautions.

Question 11Scientific Concepts

The cortex makes up the largest portion of the hair shaft. Which property is most directly tied to the cortex?

  1. The oil production of the scalp
  2. The shape of the hair follicle opening
  3. The shine produced by the cuticle
  4. The strength, elasticity, and color of hair Correct answer.

Explanation

The cortex contains the bulk of the hair's protein and melanin, so it determines strength, elasticity, and natural color. The cuticle provides shine and protection, and the follicle shape influences curl pattern. Damage to the cortex cannot be fully repaired, which is why protein and moisture balance matters.

Question 12Scientific Concepts

A client's hair feels rough, tangles easily, and absorbs water very quickly. Which condition does this most likely indicate?

  1. Low porosity
  2. Normal elasticity
  3. Oily scalp
  4. High porosity Correct answer.

Explanation

High porosity means the cuticle is raised or damaged, so hair absorbs moisture quickly but loses it just as fast, causing roughness and tangling. Low porosity resists moisture and products sit on the surface. Treatment usually focuses on protein and gentle pH-balanced conditioning.

Question 13Scientific Concepts

Which of the following best describes the purpose of the pH scale in salon products?

  1. It measures the viscosity of a product
  2. It measures the temperature of a solution
  3. It determines the color of the product
  4. It indicates acidity or alkalinity on a 0 to 14 scale Correct answer.

Explanation

The pH scale runs from 0 to 14, with 7 neutral; below 7 is acidic and above 7 is alkaline. Salon products use pH to open or close the cuticle and to support chemical services safely. Viscosity and temperature are separate measurements.

Question 14Scientific Concepts

Which ingredient is commonly used in shampoo to attract and hold moisture in the hair?

  1. Preservative
  2. Surfactant
  3. Humectant Correct answer.
  4. Silicone

Explanation

Humectants attract water from the air and help hair retain moisture, improving softness and manageability. Surfactants cleanse by lifting oils, preservatives prevent microbial growth, and silicones add shine and slip. Distinguishing these functions guides product selection.

Question 15Scientific Concepts

A client with a sensitive scalp and dry, fragile hair needs a shampoo recommendation. Which choice is most appropriate?

  1. A high-alkaline clarifying shampoo used daily
  2. A strong antidandruff shampoo used twice daily
  3. A volumizing shampoo with high surfactant content
  4. A gentle, pH-balanced shampoo with moisturizing ingredients Correct answer.

Explanation

A gentle, pH-balanced formula with moisturizers cleanses without stripping fragile hair or irritating a sensitive scalp. High-alkaline or strong clarifying shampoos can further dry the hair and scalp. Matching product intensity to scalp and hair condition is a core consultation skill.

Question 16Scientific Concepts

Which of the following is the correct order of the layers of the hair shaft from outermost to innermost?

  1. Cortex, cuticle, medulla
  2. Cuticle, medulla, cortex
  3. Medulla, cortex, cuticle
  4. Cuticle, cortex, medulla Correct answer.

Explanation

The hair shaft has three layers: the cuticle on the outside, the cortex in the middle, and the medulla at the core. The cuticle protects, the cortex provides strength and color, and the medulla is often absent in fine hair. This order is fundamental to understanding chemical services.

Question 17Scientific Concepts

Which statement about the growth cycle of hair is accurate?

  1. The resting phase is the longest growth period
  2. Each follicle cycles independently through growth phases Correct answer.
  3. All scalp hair grows in the same phase at once
  4. Hair grows continuously without a resting phase

Explanation

Each follicle follows its own cycle independently, which is why people shed a small amount of hair daily rather than all at once. The cycle includes anagen growth, catagen transition, and telogen rest. The resting phase does not produce growth.

Question 18Scientific Concepts

Which of these best explains why over-processing with a relaxer can permanently weaken hair?

  1. It breaks too many disulfide bonds and damages the cortex Correct answer.
  2. It increases sebum production
  3. It changes the color of the medulla
  4. It removes the cuticle entirely

Explanation

Over-processing breaks an excessive number of disulfide bonds and can degrade the cortex, leaving hair weak and brittle. The cuticle may also be damaged, but the key structural loss is in the cortex. This is why timing and strength must match hair condition.

Question 19Scientific Concepts

A client wants to go from dark brown to light blonde in one session. Which professional consideration is most important?

  1. Only a temporary color should be used
  2. The hair's underlying pigment and condition must be assessed before lifting Correct answer.
  3. The service should skip a strand test
  4. The developer should be mixed with conditioner

Explanation

Lightening reveals underlying pigments, and the amount of lift depends on starting level, hair condition, and developer strength. Assessing condition and underlying pigment prevents excessive damage and unpredictable results. A strand test confirms timing and outcome before committing.

Question 20Scientific Concepts

Which statement about the relationship between the hair cuticle and chemical services is correct?

  1. The cuticle must be lifted for chemicals to reach the cortex Correct answer.
  2. A tightly closed cuticle speeds up chemical processing
  3. The cuticle is unaffected by pH
  4. A raised cuticle protects the cortex during processing

Explanation

Chemical services require the cuticle to lift so active ingredients can reach the cortex. Alkaline products raise the cuticle, while acidic products help close it afterward. A tightly closed cuticle actually slows penetration, which is why low-porosity hair may need more processing time.

Question 21Scientific Concepts

Which of the following best describes the function of sebum?

  1. It lightens the hair shaft
  2. It provides pigment to the cortex
  3. It breaks disulfide bonds
  4. It lubricates the skin and hair and helps retain moisture Correct answer.

Explanation

Sebum is an oily substance produced by the sebaceous glands that lubricates the skin and hair and helps limit moisture loss. It does not lighten hair, break bonds, or provide pigment. Excess sebum contributes to an oily scalp and buildup.

Question 22Scientific Concepts

A client with a contagious scalp condition arrives for a service. What is the most appropriate professional action?

  1. Refuse the service and refer the client to a physician Correct answer.
  2. Proceed with the service while wearing gloves
  3. Apply a medicated treatment and continue
  4. Disinfect the tools afterward and continue

Explanation

Contagious scalp conditions such as ringworm or impetigo are contraindications for service, and the client should be referred to a physician. Proceeding risks spreading infection to the cosmetologist and other clients. Disinfection afterward does not make it acceptable to perform the service.

Question 23Scientific Concepts

Which of the following is a primary function of the epidermis?

  1. Storing fat for insulation
  2. Acting as a protective barrier against the environment Correct answer.
  3. Housing the hair papilla
  4. Producing sebum for the scalp

Explanation

The epidermis is the outer protective layer that serves as a barrier against water loss, chemicals, and microorganisms. Sebaceous glands, fat storage, and the hair papilla are located in deeper layers. Barrier function explains why intact skin protects underlying tissue.

Question 24Scientific Concepts

Which statement correctly distinguishes melanin from keratin in hair?

  1. Both provide color only
  2. Melanin provides color; keratin provides structure Correct answer.
  3. Keratin provides color; melanin provides structure
  4. Both provide structure only

Explanation

Melanin is the pigment produced in the follicle that gives hair its color, while keratin is the protein that builds the hair's structure. Loss of melanin with age leads to gray hair, but the keratin structure remains. Understanding both helps explain color services and hair strength.

Question 25Scientific Concepts

Which of the following best explains why a neutralizer is applied after a permanent wave?

  1. To remove residual color
  2. To raise the cuticle further
  3. To rebuild disulfide bonds in the new shape Correct answer.
  4. To add moisture to the hair

Explanation

The waving lotion reduces disulfide bonds so the hair can be reshaped on rods, and the neutralizer oxidizes them back into place. This locks the new curl pattern. Without neutralizer, the wave would not hold and the hair would remain weakened.

Question 26Scientific Concepts

A client's natural hair is classified as a strong Level 3 texture with a tight curl pattern. Which chemical service consideration follows most directly from this texture classification?

  1. The cuticle layers are tightly packed, so processing solution will penetrate slowly and timing must be extended. Correct answer.
  2. The hair is fine and fragile, so a milder reducing agent should be selected to limit damage.
  3. The hair has an oval-to-round cross section, so straightening is impossible without prior relaxing.
  4. The hair has low porosity and resists absorbing moisture, so pre-softening with water is required.

Explanation

Texture classification reflects the diameter of the hair and how tightly the cuticle scales lie against the shaft. Coarse, tightly curled hair generally has overlapping cuticle layers that slow the penetration of water and chemicals, so the professional allows more processing time and monitors closely. This is a standard application of texture theory rather than a rule about color or shape.

Question 27Scientific Concepts

A stylist is selecting a lightener for a client whose hair was previously colored with a metallic dye. What is the most important scientific reason to avoid an immediate oxidative lightening service?

  1. Metallic salts can react with peroxide to generate heat and cause severe damage or breakage. Correct answer.
  2. Metallic dyes increase the hair's porosity so much that lightener will process too quickly to control.
  3. Metallic dyes deposit only on the cuticle, so the lightener cannot lift the natural pigment beneath.
  4. Metallic dyes contain no pigment and therefore cannot be lightened by any oxidative product.

Explanation

Some metallic dyes contain metal salts that react exothermically with hydrogen peroxide, producing heat that can burn the scalp and severely damage the hair shaft. For this reason, professionals test for metallic salts and generally avoid oxidative lightening over them. The other options misstate how metallic dyes behave.

Question 28Scientific Concepts

Two swatches of the same hair sample are tested: one is placed in water at room temperature and one in a solution at pH 11. Based on the chemistry of the hair shaft, which outcome is most consistent with expected behavior?

  1. The alkaline solution shrinks the hair shaft by tightening the cuticle scales and expelling water.
  2. The alkaline solution softens and swells the cuticle more than water because it disrupts ionic and hydrogen bonds. Correct answer.
  3. Both swatches behave identically because pH affects only the color of the solution, not the hair structure.
  4. The water swells the cuticle more because neutral solutions penetrate the cortex more readily than alkaline ones.

Explanation

Alkaline solutions raise the pH and cause the cuticle to swell and soften, which allows greater penetration of chemicals and can increase the risk of damage. Water alone swells hair far less because it does not disrupt as many of the ionic and hydrogen bonds. This principle underlies why high-pH products demand careful timing and monitoring.

Question 29Hair Care and Treatments

Which pH range describes a hair relaxer that is strong enough to break disulfide bonds through the lye (sodium hydroxide) mechanism?

  1. pH 4.5 to 5.5
  2. pH 2.0 to 3.0
  3. pH 11 to 14 Correct answer.
  4. pH 7.0 to 7.9

Explanation

Sodium hydroxide relaxers are strongly alkaline products that typically register near pH 12 to 14, and this high alkalinity is what allows the product to break the disulfide bonds that give hair its curl. Acid-balanced and neutral-pH products cannot accomplish that chemical change on their own.

Question 30Hair Care and Treatments

A client's hair is described as having low porosity. Which behavior should the stylist expect when applying a conditioning treatment?

  1. The hair tangles only at the ends because the cortex is permanently swollen
  2. The cuticle absorbs moisture rapidly and the hair over-conditions quickly
  3. The hair loses moisture faster than it gains it and needs frequent reapplication
  4. The cuticle resists moisture, so the product sits on the surface and warmth or steam helps penetration Correct answer.

Explanation

Low-porosity hair has a tightly layered cuticle that resists the entry of water and conditioning agents, so product tends to sit on top rather than absorb. Applying heat or steam temporarily lifts the cuticle and improves penetration of the treatment.

Question 31Hair Care and Treatments

Which term describes the outer, overlapping layer of the hair shaft that protects the cortex?

  1. Medulla
  2. Cuticle Correct answer.
  3. Follicle
  4. Cortex

Explanation

The cuticle is the outermost layer of the hair shaft, made of overlapping scales that shield the inner cortex from damage and control how much moisture enters and leaves.

Question 32Hair Care and Treatments

Which shampoo type is most appropriate for a client with an oily scalp who wants daily cleansing without stripping the ends?

  1. A heavy moisturizing shampoo with added oils
  2. A clarifying or deep-cleansing shampoo used on the scalp Correct answer.
  3. A color-enhancing shampoo for brunettes
  4. A medicated antidandruff shampoo used every day

Explanation

Clarifying and deep-cleansing shampoos remove excess sebum and product buildup from the scalp, which is what an oily scalp needs. They should be concentrated on the scalp and roots so the drier ends are not over-cleansed.

Question 33Hair Care and Treatments

What is the primary purpose of a conditioner's cationic surfactants?

  1. They dissolve mineral deposits left by hard water
  2. They bond to negatively charged hair, smoothing the cuticle and reducing static Correct answer.
  3. They raise the pH of the hair to swell the shaft
  4. They lift the cuticle to allow color molecules to enter the cortex

Explanation

Hair carries a negative charge, and cationic conditioning agents are positively charged, so they adsorb onto the surface. This smooths the cuticle, reduces friction and static, and improves combability.

Question 34Hair Care and Treatments

Which bond in the hair is broken by water and reformed on drying, allowing hair to be set temporarily?

  1. Hydrogen bond Correct answer.
  2. Peptide bond
  3. Disulfide bond
  4. Salt bond

Explanation

Hydrogen bonds are weak side bonds that water breaks and that re-form as the hair dries, which is why wet setting and blow-drying with tension create temporary shape. Disulfide bonds require chemical relaxers or perms to change.

Question 35Hair Care and Treatments

A stylist is selecting a thermal protectant before flat-ironing. Which product characteristic is most useful?

  1. A silicone-based spray that coats the shaft and resists heat transfer Correct answer.
  2. A clay-based scalp mask
  3. A high-alcohol setting lotion that dries stiff
  4. A high-pH alkaline shampoo

Explanation

Silicone and polymer thermal protectants form a film on the hair that slows heat transfer to the cortex and reduces friction from the iron. This lowers the risk of moisture flash-off and cuticle cracking during styling.

Question 36Hair Care and Treatments

Which statement accurately describes the relationship between the cortex and hair color services?

  1. The cortex produces new pigment continuously throughout the hair's life
  2. The cortex is a dead protective shell that color cannot penetrate
  3. The cortex is the oil-producing gland of the follicle
  4. The cortex holds melanin and the bonds that color and waving services alter Correct answer.

Explanation

The cortex is the middle layer of the shaft and contains the melanin granules as well as the disulfide and other side bonds. Color and waving services must penetrate the cuticle to act on the cortex.

Question 37Hair Care and Treatments

A client with fine, limp hair wants more volume. Which combination best supports that goal without weighing the hair down?

  1. A smoothing serum applied generously to the scalp
  2. A deep moisturizing mask left on for 30 minutes
  3. A heavy leave-in cream applied from mid-shaft to ends
  4. A volumizing shampoo with a lightweight bodifying mousse applied at the roots Correct answer.

Explanation

Fine hair has a small diameter and is easily weighed down, so lightweight volumizing products applied at the roots add body without residue. Heavy creams and oils coat the shaft and collapse the style.

Question 38Hair Care and Treatments

What is the recommended approach when applying a relaxer to a client whose scalp shows irritation and small abrasions?

  1. Postpone the service and allow the scalp to heal before relaxing Correct answer.
  2. Apply a protective base and proceed as usual
  3. Apply the relaxer quickly and rinse with cool water
  4. Use a stronger formula so the service finishes faster

Explanation

Relaxers are strongly alkaline and will burn broken skin, so any abrasion or irritation is a contraindication. The service should be postponed until the scalp is intact, and the client should be advised to avoid scratching before the next appointment.

Question 39Hair Care and Treatments

Which result should a stylist expect from a properly performed acid-balanced perm versus an alkaline perm?

  1. No curl at all because acid perms only straighten
  2. Tighter curl with more swelling and stronger odor
  3. Softer, more conditioned curl with less cuticle swelling and a milder odor Correct answer.
  4. Permanent straightening of previously curled hair

Explanation

Acid-balanced perms operate at a lower pH, so they cause less swelling of the shaft and leave more moisture and condition in the hair. They typically produce a softer curl and have a gentler odor than alkaline perms.

Question 40Hair Care and Treatments

A client's previously lightened hair feels gummy when wet. What does this indicate and how should the stylist respond?

  1. Significant cortex damage with loss of protein structure; avoid further chemical service and recommend reconstructive care Correct answer.
  2. A buildup of conditioner that will rinse away with clarifying shampoo
  3. A sign the hair is ready for a stronger lightener
  4. Normal behavior for lightened hair; proceed with a perm the same day

Explanation

Gummy, mushy wet hair signals that the cortex has lost structural integrity, often from overlapping lightener or over-processing. Adding more chemicals risks breakage, so the hair needs protein and moisture rehabilitation first.

Question 41Hair Care and Treatments

Which ingredient class in a moisturizing conditioner primarily attracts and holds water within the hair?

  1. Humectants such as glycerin and panthenol Correct answer.
  2. Anionic surfactants such as sodium lauryl sulfate
  3. Silicones such as dimethicone
  4. Preservatives such as phenoxyethanol

Explanation

Humectants are hygroscopic ingredients that draw moisture from the air and the product into the hair and help retain it. Glycerin and panthenol are common examples in moisturizing conditioners.

Question 42Hair Care and Treatments

A stylist is performing a strand test before a color service. What is the main purpose of this test?

  1. To check whether the client is allergic to the developer
  2. To predict how the hair will respond to the formula and timing before committing the whole head Correct answer.
  3. To determine the client's natural hair color level
  4. To measure the porosity of the scalp

Explanation

A strand test shows how a specific formula interacts with the client's hair, including how quickly it lifts or deposits and whether the result is on target. This lets the stylist adjust the formula or timing before applying it to the entire head.

Question 43Hair Care and Treatments

Which situation calls for a clarifying treatment rather than a moisturizing conditioner?

  1. Hair that is overly soft and limp after deep conditioning
  2. Dry, brittle hair that snaps when stretched
  3. Freshly lightened hair that feels porous
  4. Dull hair with heavy product buildup and mineral deposits from hard water Correct answer.

Explanation

Clarifying treatments remove residue such as styling product, silicones, and hard-water minerals that coat the shaft and cause dullness. Moisturizing conditioners add substance but cannot dissolve that buildup.

Question 44Hair Care and Treatments

What does the overlapping scale pattern of a healthy cuticle do for the hair shaft?

  1. It contains melanin that determines hair color
  2. It lies flat to seal the cortex and limit moisture loss Correct answer.
  3. It produces sebum to lubricate the shaft
  4. It stands open permanently to allow constant moisture exchange

Explanation

In healthy hair the cuticle scales lie flat and overlap like shingles, forming a barrier that holds moisture in the cortex and protects it from friction and chemicals. When the scales are raised or missing, hair loses moisture and feels rough.

Question 45Hair Care and Treatments

A client who swims regularly in a chlorinated pool asks how to protect her lightened hair. Which advice is most accurate?

  1. Apply a heavy oil to the scalp only before swimming
  2. Use a high-pH alkaline shampoo immediately after each swim
  3. Wet the hair with fresh water and apply conditioner before swimming, then rinse and cleanse afterward Correct answer.
  4. Skip shampoo after swimming so the chlorine stays in the hair

Explanation

Saturating dry, porous hair with fresh water and conditioner before swimming reduces how much chlorinated water the shaft absorbs. Rinsing and gently cleansing afterward removes chlorine residue before it can continue oxidizing the hair.

Question 46Hair Care and Treatments

Which statement correctly distinguishes a hydroxide relaxer from a thio relaxer?

  1. Hydroxide relaxers are not neutralized with a separate neutralizer, while thio relaxers require one Correct answer.
  2. Both relaxer types are neutralized with the same hydrogen peroxide solution
  3. Thio relaxers straighten by coating the hair with oil
  4. Hydroxide relaxers require a neutralizer, while thio relaxers do not

Explanation

Lye and no-lye hydroxide relaxers straighten by a lanthionization process that does not require a separate neutralizing step; thorough rinsing and an acidic shampoo restore pH. Thio relaxers break disulfide bonds and must be neutralized to rebuild them.

Question 47Hair Care and Treatments

A client reports that her hair has become drier and rougher since she began using a high-heat flat iron daily. What is the most likely explanation?

  1. The iron has permanently changed the client's natural color level
  2. Repeated heat exposure has raised and cracked the cuticle, increasing porosity and moisture loss Correct answer.
  3. Daily ironing has increased sebum production in the follicle
  4. The iron has strengthened the disulfide bonds and made hair brittle

Explanation

Repeated high heat causes moisture inside the shaft to flash into steam, which can crack and lift cuticle scales. The roughened, more porous surface then loses moisture faster, leaving hair dry and rough.

Question 48Hair Care and Treatments

Which shampoo pH is generally best for maintaining color-treated hair?

  1. Strongly alkaline, around pH 10
  2. Exactly neutral, pH 7.0
  3. Slightly acidic, around pH 4.5 to 5.5 Correct answer.
  4. Strongly acidic, around pH 2

Explanation

Slightly acidic shampoos keep the cuticle closed, which reduces color loss and leaves the surface smooth and shiny. Strongly alkaline products swell the cuticle and allow dye molecules to escape faster.

Question 49Hair Care and Treatments

Which factor most directly determines how much a lightener can lift a client's natural hair?

  1. The length of the hair shaft below the shoulders
  2. The client's natural oil production on the scalp
  3. The number of layers of cuticle scales on the surface
  4. The amount and type of melanin present in the cortex Correct answer.

Explanation

Lifting means removing natural pigment, so the starting level and the type and density of melanin in the cortex set the ceiling for how light the hair can go. Underlying pigment also explains the warm tones that appear during lifting.

Question 50Hair Care and Treatments

A stylist must choose between a surface conditioning treatment and a reconstructive treatment for hair that is mushy when wet and breaks with little tension. Which choice is correct and why?

  1. Surface conditioning, because the cuticle only needs smoothing
  2. Clarifying treatment, because buildup is causing the mushiness
  3. A light protein-free moisturizer, because protein would harden the hair further
  4. Reconstructive treatment, because the cortex has lost protein structure and needs strengthening Correct answer.

Explanation

Mushy, weak wet hair indicates that the cortex has lost protein and internal structure, which is the specific condition reconstructive protein treatments address. Surface conditioners only smooth the cuticle and cannot rebuild lost internal mass.