Nail biters, listen to this. That could be a very expensive habit down the road if you care about your teeth.
The Academy of General Dentistry warns that nail biting is hard on your teeth. Apparently, the constant pressure of sinking your teeth into your nails can wear down and even chip off enamel. Because even though enamel is one of the strongest substances on earth, it can crack.
So nail biters can end up needing expensive dental restoration work down the road.