Pennsylvania Cosmetology Practice Exam 2026 - Free Cosmetology Practice Questions and Study Guide

Over-processing hair during chemical treatments often results in dryness and brittleness, making this the most accurate symptom associated with such damage. When hair undergoes chemical treatments, such as coloring, perming, or relaxing, the cuticle—the outer protective layer of the hair—can become compromised. This can lead to the loss of moisture and natural oils that keep hair healthy and resilient. As a result, the hair becomes dry, loses its elasticity, and can develop a brittle texture, making it prone to breakage.

In contrast, an oily scalp is typically related to excessive sebum production, which is not a direct consequence of chemical treatment. Increased shine is associated with healthy, well-moisturized hair, while over-processed hair tends to have a dull, lackluster appearance. Thicker hair strands might be mistakenly considered a benefit of treatment, but in reality, over-processing can lead to increased porosity and thinner strands due to damage. Thus, understanding these effects emphasizes the importance of following proper guidelines and taking care during chemical processing to maintain hair health.