Have ever bitten your tongue when eating?

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It hurts me again... Have you suffered from such pain before? When you're eating, you bite your self at the tongue or somepart insid your mouth? I think most of us have such experience,right. I can't remember how many times I have. In my memory, maybe already hundreds of times. Every time that happens, I always think why do we bite ourself? We eat so easily and our tongue, teeth or lip worked so good with each other, why do they fight now and then? Maybe because we are not evolved thoroughly.