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Sorry to hear you're in pain -
Pain on biting could be one of several issues.
1. If your wisdom tooth is partially erupted but tissue covers a portion of it you may be biting on the tissue when you close. That is often the cause of such pain.
1. If your wisdom tooth is impacted and has wedged the next tooth so that the next tooth is a bit higher than before that could also cause the pain.
3. If you have an infection in a tooth - or have accidentally traumatized it by biting too hard or a blow to your mouth or jaw,, swelling in the socket will push the tooth up a bit and create pain when biting.
4. If a filling was recently placed that is too high (excess filling material), you may experience pain on biting.
The most likely reason is a wisdom tooth problem. That should be ruled out first with an xray at your dentist's office. He or she will evaluate you and definitively determine the cause of your pain.
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If the pain is minor, I would recommend waiting one week and avoiding pressure or hot foods on the area. If the pain remains or worsens after one week it would be wise to see your dentist.
If opening your mouth wide is painful it seems more likely that your issue is either a wisdom tooth problem or "clenching" or grinding habit which can occur during sleep - often during periods of stress. If the latter is the problem, your dentist may recommend making an appliance to wear at night which is worn to alleviate the pain.
Gargling with warm water and a teaspoon of salt will help if the tissue is inflamed. Rinsinsing or gently brushing with a solution of 3% Hydrogen Peroxide mixed 1 : 3 (three parts water to one part Peroxide) can also ease tissue inflammation. Rinse or brush for no more than about 15 seconds. And discontinue use if you find the solution irritating.
Ibupropohen (Advil) is very good - not only for reducing pain, but reducing inflammation and promoting healing.
But do see a dentist if the pain persists or worsens.
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