Compared to coarse and gray hair, which type can withstand less heat?

Fine hair is more delicate and has a smaller diameter compared to coarse and gray hair, making it more vulnerable to heat damage. The structure of fine hair lacks the dense cuticle layers found in coarse hair, which offers some protection against high temperatures. When heat is applied, fine hair can become weak and brittle, leading to breakage and damage more easily than coarser hair types, which are generally more resilient.

In contrast, long hair or short hair doesn't inherently affect the hair's ability to withstand heat; it's more about the individual hair texture rather than its length. Conditioned hair may have treatments that help protect it from damage, but this doesn't change the fundamental characteristics of the hair type itself. Therefore, fine hair stands out as needing more caution when exposed to heat styling tools.