Toothache has the following causes: First, tooth decay, teeth form deep caries or pulpitis symptoms, can appear toothache symptoms. Periodontitis, when periodontitis causes gum atrophy, it will lead to tooth sensitivity, which will produce hot and cold stimulation pain, or cause periodontal abscess will also appear tooth pain phenomenon. Wisdom tooth eruption, when the wisdom tooth eruption, it is likely to appear wisdom tooth pericoronal abscess and jaw gap infection symptoms, so it will produce toothache phenomenon. Fourth, tooth splitting, when the tooth is not timely restorative treatment, the tooth may appear crown fracture, root fracture or crown root fracture phenomenon. This will be followed by biting pain or periapical abscess. All of these phenomena need to be seen by the dentist in time. In case of tooth decay, filling treatment is needed; periodontitis requires scaling and scraping treatment; wisdom tooth can choose to be flushed or extracted depending on the situation; and pulp splitting can be treated by extraction, but all of them should be done after the inflammation is eliminated.