onychophagia
onychophagy

Nail biters have what doctors call onychophagia.

Nail-biting (onychophagia) is a common stress-relieving habit.

Onychophagia (also onychophagy) or nail biting, is a common oral compulsive habit in children and adults.

Onychophagia (compulsive nail biting)

It is not the same as onychophagia, where the nails are bitten or chewed or dermatillomania, where skin is bitten or scratched.

Trichotillomania may lie on the obsessive-compulsive spectrum, also encompassing obsessive-compulsive disorder, nail biting (onychophagia) and skin picking (dermatillomania), tic disorders and eating disorders.

In the active skeletal growth mouthbreathing, finger sucking, thumb sucking, pacifier sucking, onychophagia (nail biting), dermatophagia, pen biting, pencil biting, abnormal posture, deglutition disorders and other habits greatly influence the development of the face and dental arches.