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So, why do my teeth ache?
Toothaches caused by sinus infection can occur when the maxillary molars, the roots of the upper back teeth, extend into the maxillary sinus cavity. To see if this is the case, your dentist can take a periapical x-ray that shows the sinus area above the tooth roots. How will I know if my toothache is caused by a sinus infection?
The first thing most dentists perform is a percussion test. The dentist gently taps on the tops of the teeth to see which teeth hurt. In most cases, when there is a dental problem, only one tooth will hurt when tapped. All your teeth will hurt if it is a sinus problem.
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