2.0 Hair Care and Services Cosmetology Practice Quiz

• A. Pulling a single strand taut to measure its length change before and after wetting
• B. Counting the number of hairs per square centimeter using a density trichometer
• C. Placing the hair under a UV lamp to observe the color of the cortex
• D. Sliding the fingers along a dry strand from tip toward the scalp and feeling for resistance or roughness indicating open cuticle scales

Porosity refers to the hair's ability to absorb moisture and chemicals through the cuticle; a quick test involves sliding two fingers along a dry strand from tip toward the scalp, rough or bumpy texture indicates raised, open cuticle scales and high porosity, while smooth resistance indicates a compact, low-porosity cuticle.

• A. Proceed with the scalp treatment using a soothing, fragrance-free product to calm the irritation
• B. Decline the service, document the observation, and refer the client to a physician before providing any scalp service
• C. Apply a tea tree oil scalp massage to disinfect the scalp naturally and continue the service
• D. Shampoo the scalp gently with an antibacterial shampoo, then proceed with the scalp treatment

Pustular scalp lesions (such as folliculitis or impetigo) indicate a possible bacterial or infectious condition that constitutes a contraindication for scalp services; the appropriate professional response is to decline the service, document the observation in the client's record, and refer the client to a physician for evaluation and treatment.

• A. Proceed with all requested chemical services, as flaking is always a normal finding requiring no special assessment
• B. Apply a hot oil treatment immediately to address the dryness before further analysis
• C. Document the finding, assess whether the condition contraindicates the planned service, and recommend the client consult a physician if the condition appears inflammatory or infectious
• D. Dismiss the client immediately, as any scalp flaking is a universal contraindication for all salon services

Professional practice requires documenting scalp findings, assessing whether the observed condition (tight silver-white adherent scales with peri-follicular redness, consistent with scalp psoriasis) contraindicates the planned service, and referring the client to a physician if the condition appears inflammatory, infected, or otherwise beyond the cosmetologist's scope of practice.

• A. No concern exists, any relaxer can be applied over any previous relaxer as long as the application is limited to new growth only
• B. The combination of guanidine hydroxide previously applied and sodium hydroxide applied now creates a strong alkaline interaction that can severely damage or destroy the hair shaft
• C. The concern is purely cosmetic, sodium hydroxide will only alter the color of previously relaxed hair, causing unwanted toning
• D. The only contraindication is the six-week interval, which is too short; waiting twelve weeks resolves all chemical incompatibility

Sodium hydroxide (lye) and guanidine hydroxide (no-lye) are both hydroxide-based relaxers but are chemically distinct; applying sodium hydroxide over hair previously treated with guanidine hydroxide creates a chemical incompatibility that produces an intense alkaline reaction capable of severely weakening or destroying the hair shaft, the two systems must never be used on the same hair.

• A. The strand falls completely straight, indicating the disulfide bonds have fully broken and need no further processing
• B. The strand forms a firm, defined S-wave slightly larger than the rod diameter, indicating adequate processing
• C. The strand appears gummy and stretches without returning, indicating processing should continue for 10 more minutes
• D. The strand holds the exact diameter of the rod with no relaxation, indicating the wave is too tight and must be rinsed immediately

A properly processed permanent wave strand, when unwound from the rod, forms a firm, defined S-wave shape that is slightly larger than the rod diameter; this indicates that enough disulfide bonds have been softened and the hair has taken on the shape of the rod, and it is ready for neutralization.

• A. The hair has excellent elasticity and is an ideal candidate for a standard alkaline wave
• B. The hair has poor elasticity, suggesting compromised disulfide bond integrity; a permanent wave would likely cause breakage
• C. The snap-back response indicates extremely high porosity, which will cause the hair to over-absorb wave solution
• D. The hair's low elasticity indicates it is too oily for a permanent wave and requires clarifying before the service

Healthy wet hair can stretch approximately 20-30% and spring back slowly; a strand that barely stretches before snapping indicates severely compromised disulfide bond integrity and protein structure, the cortex cannot accommodate the additional chemical stress of a permanent wave without significant breakage risk.

• A. Latex-containing gloves or elastic neck strips, which must be replaced with latex-free alternatives before the service begins
• B. The shampoo bowl, which may contain trace latex from previous clients
• C. The permanent wave rods, which are often manufactured using latex rubber bands
• D. Hair color developer, which contains a latex-based stabilizer that can trigger allergic reactions

Latex gloves worn by the cosmetologist and latex elastic neck strips placed against the client's skin are the most common sources of latex exposure in the salon; for a client with a latex allergy, both must be replaced with latex-free alternatives (nitrile gloves and cloth or latex-free neck strips) before any service begins to prevent an allergic reaction ranging from contact dermatitis to anaphylaxis.

• A. Use a lower-volume developer, shorter processing time, and mild acid-wave solution to avoid overprocessing the already-fragile structure
• B. Avoid all chemical services, because coarse, low-porosity hair universally contraindicates chemical treatment
• C. Use only semi-permanent color without a developer, as coarse hair cannot process oxidative color
• D. Use a higher-volume developer for color, a longer processing time, and an alkaline or stronger wave solution to overcome the resistant, compact cuticle

Coarse, low-porosity hair has a compact, tightly closed cuticle that resists chemical penetration; a higher-volume developer (to generate more oxygen for better melanin dispersal), longer processing times, and alkaline or stronger wave solutions are appropriate adjustments to overcome the cuticle's resistance and achieve adequate chemical service results.