This is going to sound like a stupid solution, but it worked for me. I would designate 1 nail on each hand, that you are allowed to bite...all others are off limits. If you find yourself biting an off limit nail, stop immediatley, and if u still have the urge to bite, bite the 1 you designated.
It's kind of like "weaning" yourself out of the habit, and eventually, you wont want to bite the other 2 because they look disfigured compared to your other nails.
Once again, sounds retarded, but, it got me out of the habit!
