man, i sound like your kid. i bit my nails until i was like 16 and i looooooooooove sour stuff, including that sour patch kid stuff. really, i don't think it's too big a deal to bite your nails. i still do sometimes when i'm nervous. i mean, it's a pretty easy habit to kick unlike drinking and masturbation and eating bad food and just about everything else i've tried to quit or at least lower my usage of and failed
also, sour != bitter. i love all things sour, but detest bitter things. so if you really think its best that he stop biting his nails, it's worth a shot.
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