Periodontitis generally develops from gingivitis and is caused by irritation from dental calculus, soft deposits or dental plaque around the gums, leading to bleeding gums or bleeding when eating, as well as the further infection by bacteria causing swollen, suppurating gums and the formation of periodontal pockets. Severe cases may involve the loss of alveolar bone. Therefore, the basic treatment for periodontitis is dental cleaning, which involves removing irritants around the teeth, followed by rinsing and medicating to improve the inflammatory condition. If symptoms do not improve effectively after basic dental cleaning treatment, further treatments such as subgingival scaling to remove calculus under the gums or root planing may be necessary. If the absorption of the alveolar bone is severe, alveolar bone grafting may also be considered.