No, but I used to grind my teeth and three of my upper front teeth are chipped because of it.
I used to have to wear a bit when I slept.
Also, I sometimes chew my cuticles, but not for neurotic reasons. Just to get rid of excess flesh.
I used to, but I hated it when I cut too deep with my teeth, so I stopped.
It's not because of anxiety or anything that I used to bite my nails. It was really a mix of boredom and laziness. When I had nothing to do, I'd check my nails and then realize they needed cutting but was too lazy to grab a nail clipper so I just used the next best thing. My teeth.