For example, African-American, wavy, and curly hair tends to be the driest of all hair types because the scales on the cuticle layer don’t lay flat and aligned. They are naturally raised, which causes moisture to escape.
On the other hand, straight, Caucasian, and Asian hair, which are straight, are always perfectly aligned and sebum is evenly distributed. That’s why straight hair doesn’t always feel frizzy and is more manageable than naturally curly, kinky, or coily hair types.