Ice is bad for your teeth because ice is cold and your teeth are warm. Did you ever see Alien3? Also, ice is hard and your teeth are hard and any amount of stress on the teeth is going to cause wear.

In other news, Bulbasaur was the featured article on Wikipedia.org the other day... or quite possibly today. I can't keep track of the days anymore. Just a second...

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Ahh, it was yesterday.