I think my mother bit one of us kids back to train us not to bite, but when my kids bit at about that same age, I employed the "we'll discuss this and then you will sit by yourself in a corner and think about what you did," method of punishment.

So glad not too many people go for the "bite 'em back" routine. (Though if the biting persisted, my punishment would probably have proceeded to a swat on the butt and a threat to bite back if the perpetrator didn't mend his/her ways.)
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