TN Cosmetology common mistakes
TN Cosmetology · Understand the traps and how to avoid them.
After finishing a client, spritzes the clippers and shears with a general-purpose cleaner, wipes them with a towel, and returns them to the station drawer without ever immersing them in an EPA-registered hospital-grade disinfectant.
Candidates memorize the phrase 'clean and disinfect' as one step and, under time pressure, treat a visible wipe-down as equivalent to disinfection. The exam deliberately separates cleaning (removes debris) from disinfection (kills pathogens on a pre-cleaned surface) and gives credit only for the second when the scenario involves blood or body fluids.
What to do instead
Build a three-column table - cleaning (soap and water, removes hair, product, debris), disinfection (EPA-registered hospital-grade, tuberculocidal, full immersion for the label contact time, commonly 10 minutes), sterilization (autoclave, only for items that tolerate it). Then sort 20 items by porous/non-porous and blood-exposed/not until the classification is automatic rather than guessed.
Pours fresh disinfectant over the old solution in the jar to 'top it off,' or combines a quat with bleach or another product to make the soak 'stronger.'
Two intuitive but wrong beliefs drive this: that more chemical equals more kill, and that replenishing saves money and time. In reality organic matter and soap residue inactivate quats, and mixing chemistries can release toxic gas or neutralize both products.
What to do instead
Memorize the operating rule as a sentence you can write from memory: wash, rinse, dry the implement, then fully immerse in freshly mixed disinfectant at the label dilution, and replace the solution per manufacturer instructions or when it is visibly soiled. Treat the EPA registration label - not intuition - as the authority the exam is testing.
When a question asks where lightener works or where color molecules are deposited, names the cuticle as the target layer; when asked for the outer layer of the hair, names the medulla.
The three layer names are memorized as a list without an internal order or a function attached to each, so under exam pressure the names get shuffled. Textbook diagrams read outside-in visually but the words are rehearsed alphabetically.
What to do instead
Redraw the cross-section from the outside in and write one function beside each: cuticle (overlapping scales, protective, pH roughly 4.5–5.5), cortex (about 90 percent of the weight, melanin, disulfide bonds, strength and elasticity), medulla (innermost, may be absent). Then link each service to its layer: color and lightener must lift the cuticle to reach the cortex; perms and relaxers break disulfide bonds in the cortex.
Reads the pH scale backwards - saying a pH of 3 is more alkaline than a pH of 5, or that a pH of 9 is closer to neutral than a pH of 7 - and then mispredicts what an alkaline product does to the cuticle.
The scale is logarithmic and inverted relative to the number line candidates are used to; a bigger number feeling 'stronger' is a natural but wrong intuition, and it cascades into every question about shampoo, relaxer, and lightener pH.
What to do instead
Anchor on two fixed points and one consequence: neutral is 7, below 7 is acidic, above 7 is alkaline, and each whole step is a tenfold change. Then memorize the single tested consequence - alkaline products swell and open the cuticle, acidic products contract and close it - and use that consequence, not the raw number, to answer the question.
On a graduated or layered haircut item, states that the hair is held at 90 degrees to the head, or describes overdirection as pulling the hair away from the guideline instead of toward it.
Elevation, projection, and overdirection are learned as vocabulary rather than as a physical picture, so the numbers get attached to the wrong outcome. Candidates also confuse the direction of overdirection because they reason from the finished shape rather than from the cutting position.
What to do instead
Memorize four positions and the shape each produces: 0 degrees (one length), 45 degrees (graduation), 90 degrees (uniform layers), 135 degrees (longer layers, increased length). Physically hold a comb at each angle on your own head while saying the resulting silhouette out loud, and define overdirection as shifting the subsection toward the guideline to build weight.
When asked how to produce smooth volume with a round brush, selects high heat with the nozzle pointed against the direction of the cuticle and holds the dryer in one spot on the scalp.
High heat is mentally equated with faster, better drying, and the cuticle's directional structure is not connected to airflow direction. Heat held in one place also feels efficient, but it roughs the cuticle and risks burning the scalp.
What to do instead
Lock in the mechanic: nozzle parallel to the hair shaft, airflow directed from base to ends down the cuticle, consistent tension from the brush, moderate heat with high speed, and the dryer kept moving. Finish each section with a cool shot to close the cuticle. Match iron and dryer temperature to hair texture and condition rather than to the clock.
Chooses 40-volume developer to 'get more lift' when taking a natural level 5 to a level 9, and reuses that same formula on the previously lightened ends.
Developer strength is mentally tied to a single axis - stronger equals blonder - without the accompanying facts that volume determines lift on natural pigment only, that off-the-scalp lightener and deposit-only formulas behave differently, and that porous ends grab and process faster.
What to do instead
Memorize lift as a per-volume allowance on natural hair (10 volume deposit or about one level, 20 volume about two, 30 volume two to three, 40 volume three to four, with high-lift tint and lightener as separate categories), and always separate the three scenarios: virgin application, scalp retouch, and ends refresh. Rehearse the law of color for contributing pigment, and write the ends formula as deposit-only before writing the mid-shaft formula.
On a relaxer retouch question, describes applying product to the scalp and through the previously relaxed hair, then smoothing the whole head until the clock runs out.
The retouch is mentally filed as 'the same service again' rather than as new-growth-only, so the procedure is copied wholesale. Smoothing feels like thoroughness, and the danger of overlapping on already-processed hair is not connected to breakage in the candidate's mind.
What to do instead
Write the retouch as a fixed sequence you can recite: protect previously relaxed hair with conditioner or a barrier, base the scalp, apply to new growth only and stop short of the scalp line per manufacturer direction, follow the timed smoothing schedule, then rinse and normalize. Add the two safety checks the exam rewards - strand test first, and a neutralizer applied only after the relaxer is fully rinsed.
Performs a full facial massage over an undiagnosed raised lesion, or over skin that has just had a chemical exfoliation, and defines 'contraindication' as a synonym for 'allergy.'
Contraindication is memorized as a single vocabulary word attached to allergies, so the broader categories - contagious conditions, open or broken skin, recent chemical or surgical procedures, fever, and undiagnosed lumps - are never built out. Scenario items then get answered on instinct.
What to do instead
Sort contraindications into three buckets you can list on paper: do-not-treat at all (contagious conditions, open lesions, fever, recent surgery or peel, undiagnosed lumps), avoid-the-area (local irritation, bruising, sunburn), and get-physician-approval. Then apply the buckets to ten short scenarios until classification is instant.
Answers Tennessee law items with numbers carried over from another state's rules or from a generic textbook - guessing the required training hours, the renewal cycle, or where the license must be displayed - instead of citing the actual Tennessee figure.
Law is treated as general knowledge rather than jurisdiction-specific fact, and general study guides are used because they feel comprehensive. Tennessee items are written directly from the statute and board rules, so a plausible out-of-state number is simply wrong.
What to do instead
Build a single one-page Tennessee number sheet from the actual statute and the board's rules: required hours by license type, renewal and expiration dates, continuing education obligations, license posting requirements, salon inspection and sanitation requirements, and the employee-versus-booth-renter distinction. Drill only from that sheet, and flag any figure you cannot source as needing review rather than guessing.