We often refer to periodontal disease as a chronic infectious disease that occurs in the supporting tissues of the teeth, which are the tissues around the teeth that maintain the stability of the teeth, including the gums (dental bed), alveolar bone, periodontium and dental bone. This means that a tooth with periodontal disease can be intact and free of decay. Depending on the extent and degree of infection, periodontal disease can be broadly classified into two categories: gum disease and periodontitis. The degree of periodontitis is relatively more severe. The cause of periodontal disease is the variety of bacterial microorganisms on the tooth surface that adhere to the tooth surface in specific structures, and the bacteria themselves and the toxins they produce can cause inflammation and destruction of periodontal tissues. Therefore, it is important to maintain good oral hygiene for the prevention and treatment of periodontal disease. Patients with periodontal disease can experience bleeding gums, swollen and painful gums, and bad taste in the mouth; in advanced stages, teeth can become loose and displaced until they fall out. If these contents are helpful, you can give me feedback and I will continue to update the knowledge about periodontal disease.