Massachusetts Board of Cosmetology Practice Exam 2025 - Free Cosmetology Practice Questions and Study Guide

The main purpose of a conditioner is to hydrate and smoothen hair while preventing damage. Conditioners are specifically formulated to improve the overall texture and manageability of hair. When applied after shampooing, they work to replenish moisture lost during the cleansing process, helping to restore the hair's natural hydration levels.

Additionally, conditioners coat the hair strands, which helps to reduce friction and makes hair easier to comb or style, thereby minimizing breakage and damage. Many conditioners also include ingredients that can strengthen the hair, making it more resilient against factors like heat styling or environmental stressors.

The other options represent functions that are related but do not encompass the primary role of a conditioner. Cleansing the scalp is the role of a shampoo, not a conditioner. Adding volume typically relates to styling products specifically designed to boost fullness. Changing hair color is achieved through dyes and color treatments, which are distinct from the moisturizing and protective functions of a conditioner.