What is the effect of excessive heat on hair?

Excessive heat has a significant detrimental impact on hair health, primarily causing dryness and brittleness. When hair is exposed to high temperatures, such as those from styling tools like flat irons and blow dryers, it can strip the hair of its natural moisture. This leads to a breakdown of the cuticle, which is the protective outer layer of the hair strand, resulting in a lack of hydration and essential nutrients that keep hair strong and supple. Consequently, the structure of the hair is compromised, making it more prone to breakage, split ends, and an overall unmanageable texture.

In contrast, options that suggest an increase in shine, strengthening of the cuticle, or promotion of healthy growth fail to recognize how excessive heat impacts the hair's fundamental structure and moisture balance. Rather than enhancing hair properties, high temperatures are more likely to undermine the health of the hair, leading to the issues outlined.