Hello wanda and welcome. Thanks for sharing your concern. The roots of upper molars are in very close proximity with the maxillary sinus above. Therefore some times it becomes difficult to diagnose whether the patient presents pain due to tooth infection or sinusitis. But clinical evaluation with supporting x rays makes it clear whether the origin of infection is teeth or sinus. Therefore in my view please meet your dentist/ENT specialist for a sinus view x ray. This will make things pretty clear.Meanwhile do take good care of yourself.et us know for further doubts. Thanks. Take care.