I guess, theoretically, you could say he could get his teeth pulled out by doing this, but let's be honest. By pulling and chewing on his/her shirt they just put them selves at a disadvantage. They will spend more time worring about their shirt then their man or the ball.
I say let it go, we have more important things to worry about, like enforcing the coaching box, calling intentional fouls, and palming.
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