According to Chicoro, author of "Grow It: How To Grow Afro-Textured Hair To Maximum Lengths In The Shortest Time," the moisture level in hair matches the moisture level in the environment. Blow drying dries hair and removes natural moisture from the hair strand. This makes it prone to dryness and breakage. Air dry your strands whenever possible to avoid moisture loss.
Blow drying hair removes natural moisture from hair so it’s best to air try to avoid dry, brittle strands.