Our expert says:
Nail-biting ( if you do a google search on this term, with or without the hyphoen ) is an EXTREMELY common bad habit among kids, which usually arrives for mysterious reasons and leaves for similarly mysterious reasons. Its generally not something worth worrying about unless it becomes especially intense or damaging to the fingers. Some people use various liquids they get from the pharmacist, which are applied like nail polish but taste awful, to help to discourage the habit
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