Keep your nails in line
Use a good nourishing hand and nail cream or carefully apply a good oil (olive, rosehip, almond…). It is important that your nails are in good health so that they do not break and make you want to bite them to fix them.
Also have a file in hand. If you see that your nails are well cared for, it will give you more of a conscience to smash them with your mouth. Besides, filing will make you have a good time and you will forget about biting them.