Tennessee Cosmetology Practice Exam 2025 - Free Cosmetology Practice Questions and Study Guide

Using hot tools on damaged or chemically treated hair is a common contraindication because this type of hair is already weakened and more susceptible to further damage from heat. When hair has been subjected to chemical processes, such as coloring, perming, or relaxing, its structure can become compromised, leading to increased porosity and brittleness.

Applying heat from styling tools can exacerbate these issues, resulting in increased breakage, split ends, and overall poor hair health. It is essential for stylists to assess the condition of the hair before using heat treatments to avoid causing further harm.

On the other hand, while fine hair can be sensitive to heat as well, it is not a blanket contraindication like damaged or chemically treated hair. Thick hair may withstand higher temperatures, and curly hair may actually benefit from certain hot tools when used appropriately. Therefore, understanding the condition of the hair is crucial when deciding on the use of hot tools.