The cause of toothache on fire is generally because of the existence of diseases of the teeth themselves, on fire is the Chinese medicine, in the clinical cause of toothache common conditions are pulpitis, periapical periodontitis, wisdom tooth pericoronitis, etc., as follows. 1. Pulpitis: because of the pulp inflammation and infection of the teeth by hot, cold, acidic and sweet stimuli will produce pain, pulpitis acute stage may also appear spontaneous pain, paroxysmal pain, pain at night and other characteristic pain symptoms. 2. Periapical inflammation: Inflammatory infection develops to the periapical tissues, which will cause occlusal pain and swelling of the surrounding tissues, and when there is abscess formation, spontaneous throbbing pain will occur. 3. Wisdom tooth pericoronitis: because of inflammation and infection of the gingival flap around the wisdom tooth, resulting in swelling and pain around the wisdom tooth, and also cause pain in chewing and swallowing, with the development of the disease, there will be a spontaneous throbbing pain and radiating pain. There may be other causes of fire toothache, it is recommended to go to the hospital in time.