Our expert says:
Punishment doesn't work, and naked bribery doesn't work. Sometimes all the drama and anxiety sitirred up by your efforts to stop him, stir up the anxiety that causes him to do so, so the problem worsens. A child shrink copuld help if this has become really serious.
But otherwise a simple system can be set up in the family, offering him the bitter-tasting fingernail paint some pharmacies sell to help to remind him when he absent-mindedly starts to nibble, and a program of small rewards for each day without biting nails, and larger rewards for each week without biting. A day when he does nibble the nails gets no reward, and maybe loses a star towards the next significant reward, so he'll have to start a new full week again to earn his weekly reward.
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