Repeated episodes of toothache may be caused by pulpitis, apical periodontitis and other diseases, as follows. 1. Pulpitis: can be divided into acute pulpitis and chronic pulpitis, acute pulpitis manifested as spontaneous paroxysmal pain, night pain, temperature stimulation exacerbated pain and pain can not be self-localized, chronic pulpitis manifested as a paroxysmal dull pain or dull pain, there can be a mild knocking pain, generally can be located in the affected tooth. 2. Periapical periodontitis: there are occlusal pain and percussion pain in the affected teeth, the apical part of the gums can be painful to palpate, and the teeth can be loose, or there is a sense of floating. There may be other reasons for recurring toothache, in addition to oral diseases, there may also be trigeminal nerve pain, angina radiating to the teeth. If you have recurring toothache, it is recommended to go to the hospital in time to find out the cause of the toothache and have targeted treatment.