Oklahoma Cosmetology Board Test 2025 – 400 Free Practice Questions to Pass the Exam

The primary role of a conditioner is to moisturize and protect the hair. Conditioners are designed to help restore moisture that can be lost due to washing, environmental factors, or the use of heat styling tools. They work by coating the hair shaft, which helps to smooth the cuticle and reduce friction. This not only enhances the overall appearance and texture of the hair but also provides protection against damage and breakage.

In contrast, the other options serve different purposes. Adding color to the hair typically involves hair dye or color treatments, which can change the hue but do not serve the moisturizing function of a conditioner. Thicking hair strands usually requires a specialized product such as a thickening spray or mousse, which alters the hair's texture temporarily but does not contribute to its moisture content. Cleansing excess oils is the function of shampoos, which are formulated to remove dirt and oil from the scalp and hair but do not add the protective and moisturizing benefits that conditioners do.

Overall, the emphasis on the conditioning properties emphasizes why moisture retention is crucial for healthy hair, which is why the first choice is the correct answer.