Maine Cosmetologist Practice Exam 2025 - Free Cosmetology Practice Questions and Study Guide

Using too much heat when styling hair can lead to dryness and brittleness because excessive heat damages the hair's cuticle, which is the protective outer layer. When the cuticle is compromised, it can no longer effectively seal moisture within the hair shaft. This loss of moisture results in a dry and brittle texture, making hair more prone to breakage and split ends. Proper hair care techniques typically advocate for heat protection measures and maintaining moderate temperatures when using styling tools to avoid these damaging effects. Furthermore, the other options do not align with the characteristics of hair in response to heat, as they present outcomes that are either beneficial or unrelated to the negative impact of high temperatures on hair health.