Probably not the right forum to be asking, but I can't think of a better one.

Ever since I was a little tacker, I've bit my nails. Now they're utterly disgusting. I don't purposely do it, if I concentrate I can actually grow them to quite a decent length, but then I'll watch a movie or something, and at the end realise I've destroyed them all without even realising I've done it.

I've tried those nail paints that purposely taste bad, but the taste never really offended me that much. Any advice on how to go about this would be great, thanks.