Pulpitis is an inflammatory disease caused by the invasion of bacteria or toxins into the pulp located in the center of the tooth. Spontaneous, paroxysmal pain is the main symptom. It is often clinically classified as reversible pulpitis, irreversible pulpitis, pulp degeneration and pulp necrosis. It is mostly treated by removing the pulp. The vast majority of periapical lesions, especially inflammatory ones, are secondary to pulp disease. In the case of periapical lesions, the pulp can also be affected. Acute pulpitis is an acute inflammation of the pulp tissue, the source of infection is mainly from the deep pulp, the infection of the pulp can cause apical infection through the apical foramen, the main clinical feature is severe pain, the general pain medication is not effective, the later stage can develop into pulp gangrene, the treatment mainly has open pulp and medication for pain relief. Pain is its main manifestation, manifested as severe unbearable pain, the nature of pain has the following characteristics: spontaneous pain, paroxysmal intensification, intermittent episodes, in the absence of any external stimulation, the affected tooth occurs severe pain, early pain episodes are short, the relief time is long, with the development of the disease, the late stage is a long pain episodes, the relief time is short, and even finally no relief period; night pain The pain is heavier at night than during the day, especially when lying down; early cold and hot stimulation can cause pain aggravation, late cold stimulation not only does not stimulate pain, but also makes the pain temporarily relieved, so it is common for patients to hold cold water in the mouth or inhale cold air to relieve pain, folk often say “toothache is not a disease, pain is killing people”, which refers to the symptoms of acute pulpitis in the late stage ( In addition, the pain cannot be localized and often radiates along the trigeminal nerve distribution area to the ipsilateral maxillary and mandibular teeth and adjacent parts, and the patient often cannot point out the exact location of the diseased tooth. Prevention 1, keep oral hygiene, develop good hygiene habits, insist on brushing teeth in the morning and evening or after eating, rinse mouth after meal, remove food residues and bacteria left in the mouth and between teeth in time, choose fluoride toothpaste has a certain effect on the prevention of dental caries. 2.Pay attention to the diet and oral hygiene of children. Children’s diet should be diversified, and eating some hard and tough food appropriately can promote the growth and development of their jaws and teeth. Don’t let children sleep with sugar cubes or sleep without brushing and rinsing their teeth after eating sweets, because sugar becomes acidic in the mouth and easy to corrode teeth and get caries. 3.After the permanent teeth of children aged 6-12 years old erupted, the sockets of the teeth are closed with a layer of resin material to prevent the harmful substances such as food debris and bacteria from entering the body of teeth, so as to prevent tooth decay. 4.Treat the wisdom teeth and the teeth with food blockage in time, and deal with the unsuitable dentures and braces in time. 5.Every half a year to a year to have an oral examination. 6.Treat the cavities in time when you have caries, and fill the cavities with appropriate materials after removing the damaged dentin to restore the form and function of teeth and prevent further decay; for the deep cavities, carry out appropriate treatment according to the specific situation. For pulpitis or periapical inflammation caused by tooth decay, the bacterial infection in the pulp cavity or around the tooth root should be removed and the tooth should be preserved through root canal treatment. For the residual crown and root that have lost their therapeutic value, they should be extracted and restored in time.