The roots of the upper molars are frequently embedded in the floor of the maxillary sinus. As such, the nerves supplying the upper teeth can "pick up" pain signals from an inflamed or infected sinus. Since the size of the maxillary sinus grows with age, this phenomenon can become more prominent in later years. However, it is still important to consult a dentist about severe tooth pain or changes in the size or shape of your teeth and gums. This can be a potential sign of an infection that needs to be treated immediately.