What is one of the common causes of split ends?

Excessive heat styling is a common cause of split ends because it can damage the hair's cuticle, leading to dryness and brittleness. When hair is exposed to high temperatures from styling tools like flat irons, curling wands, and blow dryers without adequate protection, it can weaken the hair shaft. This weakening can lead to the hair splitting at the ends.

While high-quality hair products and regular haircuts can help maintain hair health, they do not directly cause split ends. Exposure to UV light can also damage hair, but excessive heat styling is particularly significant as it often occurs frequently in many people's styling routines. Thus, reducing the use of heat styling tools or employing protective products can be effective strategies for preventing split ends.