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Buy an anti-nail biting preparation with Bitrex in it. The stuff tastes incredibly nasty. It's child safe, but it tastes so gross your son will likely learn fast that biting his nails tastes icky.
Also, reading the Berenstain Bears and the Bad Habit (all about Sister Bear's nail-biting habit) is a good lesson alongside the anti-nail biting stuff.
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If I am not better, at least I am different. --Jean-Jacques Rousseau
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