Since your sinuses are near your mouth, the pressure accompanying an infection can cause pain in your upper teeth. Pain in the teeth may also result from a toothache. A sinus infection ...

who lists the following as signals that your tooth pain is due to pressure from a sinus infection: Pain affects only your upper teeth. As noted above, sinus-related pain typically affects the ...

that it had expanded above the upper back tooth roots and broken into the inside of the neighbouring air sinus. This cyst had a sack as thick as a deflated balloon and was filled with pus.