What is a common result of excessive heat styling on hair?

Excessive heat styling can lead to significant damage to the hair's structure. When hair is subjected to high temperatures from tools like flat irons, curling wands, and blow dryers, it can strip the hair of its natural moisture. This loss of hydration makes the hair dry and brittle, which can result in split ends. Split ends occur when the protective outer layer of the hair is damaged, leading to a frayed appearance at the tips. Over time, consistent exposure to heat can progressively worsen this issue, leading to further hair breakage and an unhealthy appearance.

The other options, such as increased volume and healthy shine, might be temporary effects of styling but do not reflect the long-term consequences that excessive heat application has on the hair. Color fading could occur but is generally more related to chemical processes rather than heat alone. In contrast, damage and split ends are direct results of the harsh impact of excessive heat styling.