Toothaches
Most toothaches result from cavities (caused by tooth decay). Some toothaches are caused by a tooth abscess or by inflammation of the gum around the crown of a tooth (pericoronitis). Much less commonly, toothaches result from inflammation of the nasal sinuses (sinusitis).
If several upper teeth hurt when a person is chewing or is bending down (for instance, to tie a shoe), the cause is probably sinusitis--especially if the toothache develops while the person has or recently has had a cold. Additional symptoms suggesting sinusitis are headache and tenderness and swelling of the skin above the affected sinus.
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