What Causes TMD?

Many different things can cause TMD.  Trauma (car accidents, overstretching of the jaw etc) is one.  Abnormal habits such as clenching and grinding your teeth (bruxism) lip biting, and fingernail biting which cause abnormal jaw positioning can be a second.  Malocclusion, which refers to the abnormal way your teeth bite and fit together, is a third.  Another factor may be the abuse of certain prescription medications, which affects the central nervous system and the muscles that contribute to TMD.

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