What effect does combing have on the hair?

Daily combing with inadequate combs or brushes is the main cause of mechanical damage to the hair cuticle. In some cases the cuticle at ends of long hair is so severely damaged that the cortex surface is visibly exposed. Combing of dry hair leaves the cuticle thinner, however, even more extensive damage to the cuticle is done when combing wet hair. Combing of tangled hair may cause extensive damage to a considerable segment of hair, and even more damage is done when combing hair after bleaching, dyeing, perms or exposure to strong sun's rays.