Acute periapical periodontitis is clinically divided into two types: acute pulpy periapical infection and acute septic periapical infection. There are some differences in treatment and healing time between the two types, with the former generally taking about 2 weeks and the latter possibly about 3 weeks. Acute periapical periodontitis is an inflammatory reaction that occurs in the periodontium from the root apex of the tooth and can lead to a purulent periapical infection if the disease progresses, or in severe cases, to osteomyelitis of the jaws. Acute pulpy periapical periodontitis is initially only mildly painful, with pain that decreases instead when the tooth is clenched, followed by occlusal pain and a sense of elongation. The patient is usually able to accurately locate the affected tooth. At this point, it can be cured mainly after a change of medication, live pulpotomy or root canal treatment, which takes about 2 weeks to treat. Acute suppurative periapical infection is often an acute attack with continuous spontaneous severe throbbing pain, red and swollen surrounding gums, pus formation, and systemic symptoms such as fever and malaise, and treatment is based on pulpal drainage and abscess incision and drainage, followed by drug exchange, root canal treatment, and oral antibiotics, and the whole process takes about 3 weeks. Once the above symptoms appear, you should immediately seek the help of a dental specialist, carry out treatment under the guidance of the doctor, and follow up regularly.