I keep having an infrequent toothache. could it be a cavity?

Possibly: It could be. See a dentist to determine the cause of your toothaches. Even if you don't have any pain or discomfort, make sure that you brush and floss regularly and see a dentist every six months for a checkup and cleaning.

Yes it can.: The most common cause of toothache is caused by caries or tooth decay. Occasionally a tooth may have sustained fracture which is another reason for toothache.

Could be many things: Toothache can occur out of the blue and most ofthe times it is unexpected. One of the main causes of toothaches is the decay of the teeth. If you have not maintained proper oral hygiene then it can possibly result in tooth pain. Another cause of toothache can be a cracked tooth. If the roots and the nerves of your teeth are exposed to air then this can result in toothache. Consult your dentist.