Why Do We Bite Our Nails?

Nail biting has been listed in the d s m as a form of obsessive compulsive disorder. Not all experts agree that this is the best categorization for it, as not all forms of nail biting are universally considered really obsessive. There's no evidence that there's any connection whatever between nursing in early childhood and in so called oral fixations. And so another theory has emerged, that nail biting is a sort of a form of emotion regulation.