Which part of the hair is most susceptible to damage from heat styling?

The ends, or tips, of the hair are the most susceptible to damage from heat styling because they are the oldest part of the hair shaft. Over time, the natural oils that protect and moisturize the hair can diminish, leaving the ends exposed to environmental damage and the effects of heat. When styling tools such as flat irons or curling wands are used, the high temperatures can cause the cuticle layer to become compromised, leading to dryness, split ends, and breakage.

In contrast, the roots of the hair are typically thicker and have more natural oils since they are closest to the scalp, which produces sebum. The mid-lengths, while still vulnerable, are generally less prone to heat damage than the ends due to having a bit more moisture available. The hairline can experience heat damage, but it is often protected by being less frequently exposed to styling tools compared to the ends. This understanding emphasizes the importance of using heat protectants and techniques that minimize heat exposure on the ends to maintain healthy hair.