A toothache can be from a varitey of problems. Once a tooth begins to hurt, this indicates that the pulp (or nerve) of the tooth is irritated. This can be from a crack in the tooth, a gum condition, a cavity or other conditions. The treatment options range from a filling, to a root canal, a deep cleaning, or an extraction. Only a dentist can properly assess the situation, and the more it is delayed, the worse it can become!