usually it is a habit sometimes for kids but they do when they are nervous or just doing it on purpose but sometimes they don't realize that they are doing it. Also don't bite your nails because it can give you a disease.
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Other answers:Joke: How can you stop a monster from biting his nails?Punchline: Buy him a bag of screws.Joke: How can you stop a monster from biting his nails?Punchline: Send him to a Monster Reform School.
get gel nails. you can't bite them. (once i bit one off though!) it hurts! You can buy some stuff from chemists to put on them which makes them taste horrible to bite.
shoot him. haha I'm funny! or you could just tell him to stop if he's a friendly monster!
xylophone.
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