A toothache is pain that is felt in the mouth or jaw from a problem with one or more teeth or the gums. Sensitivity or pain typically moves along the nerves in the center of the tooth, known as the pulp.
A toothache may be caused by:
Although it is not as common, a toothache can be caused by a problem not related to the teeth, such as a sinus infection, shingles, or cluster headaches.
A toothache should be evaluated by a dentist right away to determine the cause of the problem and prevent the tooth from dying.
WebMD Medical Reference from Healthwise