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by briancleland 3003 days ago
The problem with nail-biting is that it is mostly unconscious. To stop doing it you need to train yourself to be aware of the behaviour. I used this technique to stop nail-biting after 35 years...

Put one finger in your mouth. Bite down. Take the finger out, look at it and say out loud "I will not bite my nails". Repeat for each finger on both hands.

Repeat this process 2-3 times a day. After a day or so you will start to "catch yourself" when you start nail-biting. After a few more days you should find the nail-biting habit diminishes and then disappears altogether. If the habit starts to return after a few months (as can happen) then simply repeat the technique.