Onychophagia or nail-biting is a common stress-relieving habit. When you are excited, stressed, bored or inactivity, you may bite your nails. This is become the most common if the typical “nervous habits,” which include thumb-sucking, nose-picking, hair-twisting or pulling, tooth grinding, and picking at skin.
About 50% of children between the ages of 10 and 18 [...]