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I used to bite my nails all the time too! It got so bad because I'd bite my nails really short and they'd sometimes end up bleeding. I finally stopped when I started painting my nails. Whenever I'd subconsciously start nibbling on my nails, I'd get nail polish pieces in my mouth AND I'd ruin my nails. Gradually, my habit stopped. If this doesn't work, you could try dipping/coating your nails in spicy or sour liquid, like hot sauce or lemon juice. The recoil of the bad taste might help. Good luck!