My bottom right canine is abnormally sharp (and crooked), and I've cut the inside of my cheek more than once on accident.
And the canine-shaving reminds me of that one episode of House where the guy wanted the nub where his thumb was sewn up because his insurance wouldn't cover a full reattachment, but the doctor decided, without telling the guy, to reattach the thumb anyway, and then billed the guy full price for the procedure, which he couldn't pay because his insurance wouldn't pay for it. He got locked in a lawsuit with the hospital over it, but I forgot how it turned out. All I remember is how much that episode really made me hate Cuddy when she told the guy that they were a business, and they'd get their money from him even if they had to take his house to get it.