It is possible to have a toothache that does not originate from the usual dental injury. Its cause may be outside the oral cavity, but very close to it. Where? It would be in the paranasal sinuses.
Some of the signs that warn of the presence of a sinus infection are: – Headache – Pain in the molars / upper teeth – Abundant nasal fluid runny nose
A helpful sign is when a sinus toothache is felt in the upper molars and affects several teeth. Also, you may feel low in energy or feverish.