CHS Study Guide 2026

Proper hydration is essential for maintaining the hair's elasticity and strength. When hair is adequately hydrated, it is more pliable and less prone to becoming dry, brittle, and breaking. Hydration helps the hair cuticle lie flat, which retains moisture, improves shine, and protects the inner cortex from damage.

A client consultation is a critical initial step in any salon service, serving as a detailed discussion between the stylist and the client. Its primary purpose is to thoroughly understand the client's desired outcome, lifestyle, hair history, and any concerns they may have. This allows the stylist to recommend appropriate services and products, ensuring client satisfaction and realistic expectations.

In a sew-in weave, natural hair is braided flat against the scalp into cornrow tracks, and then wefts of extension hair are sewn directly onto those braids using a needle and thread.

When performing chemical hair treatments, wearing gloves is essential to protect the stylist's skin from direct contact with potentially irritating or harmful chemicals. Adequate ventilation, such as open windows or exhaust fans, is crucial to disperse chemical fumes, preventing respiratory irritation for both the stylist and the client. These precautions ensure a safer working environment and minimize health risks.

Leave-in conditioners are formulated at a lower concentration to remain on the hair shaft all day, providing ongoing moisture and detangling benefits.

Permanent hair color is formulated to deeply penetrate the hair shaft and chemically alter the hair's natural pigment. Unlike temporary or demi-permanent colors, it does not wash out and grows out with the hair, providing a lasting color change. This method is used for significant color changes, complete gray coverage, and long-term results.