Various factors can stress the hair and damage its structure. These include combing, teasing, blow-drying heat, UV exposure, as well as salt and chlorinated water, and especially coloring, bleaching, and perms. All of these attack the cuticle layer that surrounds each hair and roughen it. The consequences: the hair dries out. It looks dull, straw-like, and lacks shine because incoming light can no longer be reflected.
