Toothache is a sharp, throbbing pain in the teeth and/or surrounding gums, caused by an infection or injury. It can start off as a mild ache and gradually worsen, or it can be sudden and intense. It can be accompanied by a sensitivity to hot, cold, or sweet foods and drinks, as well as swelling of the gums. It can also be a sign of an underlying issue such as a cavity, gum disease, or an abscess. Treatment includes pain relief, antibiotics, and in some cases, root canal therapy.