What is the impact of using excessively hot tools on hair?

Using excessively hot tools on hair leads to dehydration and damage because the high temperatures strip moisture from the hair shaft. Hair is composed primarily of proteins, particularly keratin, and when exposed to extreme heat, the structural integrity of these proteins can be compromised. This can result in dry, brittle hair that is more prone to breakage, split ends, and overall damage. Unlike moisture retention, which is beneficial for hair health, the application of excessive heat has the opposite effect, removing the natural oils and moisture that help to keep hair hydrated and resilient. Therefore, the understanding of thermal damage is crucial in hair care practices, especially for maintaining healthy hair.