Biting your nails is one of the top 5 bad habbits in America. It can permenatly damage your nails and lead to bacterial infections. A way to stop fast is the Hot Sauce Method.
Hot Sauce-Hotter the better
Get the hottest hot sauce you can find
Put the sauce in a bowl and put your fingernails in there for 5 minutes and then rinse your hands off. Dont use soap or it will take more of the hot oils off of your nails and wont work as well. Do not touch your eyes, ecspecially if you have contacts. If you do then rinse your eyes for 10 minutes. After that it will still burn all day.
The goal is to have your fingers not look gnawed away and look pretty again=)