E does it too. Totally makes me cringe. I called the dentist, they said it's totally normal and not to worry unless they're doing it in their sleep or to the point of crying.
Jack did this for a few weeks right after his last top teeth came through, but it was a phase...he just stopped eventually. I actually asked our dentist about it at my appt. and he said its pretty typical for them to do, just to kind of explore their teeth a little, If it doesnt stop talk to your doc though.
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Re: Grinding teeth