MN Cosmetology common mistakes
MN Cosmetology · Understand the traps and how to avoid them.
Answering a licensing-rule question by citing federal OSHA or another state's board rule instead of Chapter 155A and Minnesota Board rules - e.g., choosing an OSHA citation for an item that asks what the Minnesota board requires for a salon.
Candidates study from national test-prep material and assume licensing standards are uniform, so the most familiar-sounding authority gets picked over the actual governing one.
What to do instead
Before answering any regulatory item, label it out loud as 'Board rule (155A)', 'OSHA/federal', or 'industry guideline', and default to the Minnesota Board as the authority for scope of practice, licensure, and salon standards; memorize the board's enforcement role rather than memorizing numbers from other states.
Treating an implement that contacted blood or broken skin with a single spray-and-wipe, or dropping it straight into disinfectant without first washing off hair, product, and debris.
Under time pressure the visible stain disappears after one wipe and the step feels finished, and many candidates were taught only 'clean and disinfect' as one blended step.
What to do instead
Practice the fixed sequence: put on gloves, remove visible matter with soap and water, rinse and dry, then fully immerse in an EPA-registered hospital-grade disinfectant for the label's stated contact time; say the three steps in order before answering any disinfection item.
Completing a haircut from the original sectioning pattern and handing the client a mirror without ever cross-checking the shape from an opposing section or checking the perimeter against the guideline.
Each section looks correct on its own, so errors in elevation or overdirection only appear when viewed from a different angle - a check the candidate skips because the cut 'looks done'.
What to do instead
Build a mandatory cross-check into the service: take horizontal sections opposite the original pattern, lift perpendicular to check balance, and verify the perimeter line before styling; treat cross-checking as part of the cut, not an optional extra.
Choosing a higher-volume developer to get faster lift on hair that has already been colored, lightened, or relaxed, without first doing a strand test.
The candidate reasons from the product label ('40 volume lifts more') and skips the client-specific variable - previous chemical history - because a strand test costs minutes.
What to do instead
Make a strand test mandatory whenever there is prior chemical history, compromised porosity, or a requested change of two or more levels; document the result and select developer volume from the test, not from the desired amount of lift.
Finishing a relaxer service at the rinse and moving to conditioning, skipping the full neutralization shampoo sequence and the pH or color-indicator check, and smoothing relaxer onto previously relaxed hair during the retouch.
Relaxed hair looks and feels straight when the product comes off, so the service appears complete; overlapping is easy to do because the new growth line is hard to see without deliberate parting.
What to do instead
Treat neutralization as a distinct, non-skippable procedure with repeated lathers and an indicator check, and on retouch services apply product to new growth only, using a base and parting the hair to keep the product off previously relaxed lengths.
Wetting the hair and starting the shampoo without parting and inspecting the scalp first, so abrasions, lesions, flaking, or parasitic infestation are discovered mid-service.
Shampooing is treated as a routine, low-risk step, and the client's hair covers the scalp until it is already wet and lathered.
What to do instead
Do a structured pre-shampoo analysis: part in four sections, inspect under good light, note scalp condition and elasticity, then adjust water temperature, product, and pressure - or refer out - based on what is found.
Running a coarse electric-file bit at high speed across the natural nail plate and sidewalls, or over-filing the sidewalls with a hand file to 'tighten' the shape.
Reduction looks like precision and the damage is invisible until the nail plate thins and lifts weeks later; speed feels efficient on a timed exam and in a busy salon.
What to do instead
Keep the e-file off the natural nail plate, use it only where training and rules permit with the correct bit and speed, and refine shape and sidewalls by hand with a finer abrasive; check plate thickness by feel before and after.
Re-dipping the same spatula into the wax pot after it has touched the client's skin, and applying warm wax without checking the temperature on the inner wrist first.
A single spatula seems faster and the pot looks the same afterwards, and wax temperature is assumed from the pot setting rather than verified at the skin.
What to do instead
Use a fresh applicator for every dip or use a roll-on/disposable system, discard any wax that contacted skin, and test every batch on your own inner wrist before application; state these two rules together when answering waxing items.
Reversing the pH scale - describing pH 5 as more alkaline than pH 7 - and choosing the wrong side of the scale when explaining acid mantle, shampoo selection, or neutralizer function.
Both 'acid' and 'alkaline' are learned as adjectives attached to products, so the numerical direction of the scale is memorized as a list rather than as a relationship.
What to do instead
Anchor on one reference point: 7 is neutral, below 7 is acidic, above 7 is alkaline, and each whole number is a tenfold change; place hair (about 4.5–5.5) and skin (about 4.5–5.5) on the scale before reasoning about any product.
Performing a chemical service without a documented consultation that covers medications, pregnancy, allergies, and prior chemical services, then discovering a contraindication after the product is applied.
The consultation is seen as paperwork or small talk that delays the appointment, and clients rarely volunteer medication or allergy information unless asked directly.
What to do instead
Use a fixed intake checklist read aloud before every chemical service, record answers on the client record, obtain and note informed consent, and reschedule or refer when a contraindication appears - document the referral instead of proceeding.