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

Excessive heat styling can lead to damage and dryness in hair due to the high temperatures involved in processes like flat ironing, curling, and blow-drying. The heat can strip the hair of its natural moisture, leading to a loss of hydration which is essential for healthy hair. This results in a brittle and dry texture that can be prone to breakage, split ends, and frizz. Over time, repeated exposure to high heat can weaken the hair's structure, diminishing its overall health and appearance.

In contrast, increased shine, improved texture, and hair becoming more manageable are typically associated with well-cared-for hair that is not subjected to damaging heat. Thus, these options do not accurately reflect the consequences of excessive heat styling.