Single toothache is mostly seen in tooth decay or pulpitis. Toothache is the reaction of the nerve caused by bacterial infection, the pain is not obvious in the early stage of dental caries, timely removal of the bacterial infection part of the filling, the pain automatically disappears. Caries treatment is not timely will trigger inflammation of the dental nerve, eating pain, hot and cold, sweet and sour stimulation pain, night pain is difficult to sleep, and sometimes cause the same side of the headache or earache, is a typical manifestation of endodontic inflammation, you can carry out root canal treatment, remove the inflammation to relieve the symptoms. Therefore, a toothache is a manifestation of caries or pulpitis, which needs timely filling or root canal treatment, you can go to the dentist.