The most common cause of periapical inflammation is acute or chronic inflammation of the periapical tissues of the teeth, which develops on the basis of pulpitis, which causes inflammation of the periapical tissues of the teeth in the late stages of pulpitis when most of the pulp tissues are necrotic or with fine infection. The first thing you need to do is to get a good idea of what you are getting into. Once the abscess reaches the submucosa the pain is reduced. The chronic periapical periodontitis: chronic periapical periodontitis is divided into three cases, one for apical granuloma, one for apical abscess, and one for apical cyst, all three of which are generally painless, apical granuloma only when eating or eating will have the feeling of not being able to bite, basically no other symptoms. Apical abscesses generally have pus discharge and do not produce acute inflammation. Apical cysts can discolor the tooth and also have a ping-pong sensation because the tip of the root in the affected area is mostly semi-circular. Apical periarthritis, whether acute or chronic, needs to be treated with medication or other means under the guidance of a dentist to avoid atrophy and necrosis of the pulp, which can cause tooth loss, etc., as well as regular dental checkups and cleanings such as scaling.