How do i break my habit of biting my nails?

Put something...: On them that tastes terrible, yet is harmless - lemon juice, castor oil, etc.

Different Options: There are a few ways you can stop biting your nails. One way is to pick one nail and not bite that one for awhile, once it's been about 2-3 weeks notice how good that nail looks. Then, pick another nail and don't bite it for awhile, continue this until you aren't biting your nails anymore. Another step is to keep yourself occupied, chew gum or do an activity that requires using your hands.