The dental nerve is generally located inside the tooth and is surrounded by dentin. The nerve, also known as the pulp, is a loose connective tissue that is connected to the periapical tissue by means of the apical foramen. The external tissues of the tooth are hard, the interior is hollow and contains a large number of blood vessels and nerves. The nerves supply blood and provide nutrients to the tooth. It also strengthens the tooth through the absorption and transformation of minerals. At the same time, the nerve has a sensory role. When the patient is stimulated by the outside world, the teeth may feel the pain and play a certain early warning role. We should pay attention to the protection of teeth in our daily life, avoid eating too hard, too sweet and other foods, if there are dental problems, should go to the hospital stomatology department in a timely manner, under the diagnosis of a professional doctor for treatment.