I know a lot of people bite their nails. My friends daughter used to bite hers so low they bled. She even used to bite all around them too...the skin.I can't stand even having mine cut too short, and if they break I couldn't bite them then either. It's just something that sets my teeth on edge, like chalk or nails squeaking on a blackboard....oooh! even the thought of that has made me go cold!!