If periodontitis has already caused facial swelling, active treatment can be targeted at the periodontitis. First, if there are large deposits of tartar on the crown of the tooth, these should be removed using ultrasonic cleaning to eliminate the tartar and suppress the proliferation of anaerobic bacteria. Then, manually scrape the tartar, diseased bone, and granulation tissue attached to the root surface of the gums and thoroughly rinse with hydrogen peroxide solution. If an abscess has already formed in the periodontal area, it needs to be incised under local anesthesia, then drain it using a rubber strip, and treat with systemic antibiotics such as cephalosporins or nitroimidazole drugs to alleviate the patient’s condition.