Periodontitis scaling surgery is a very well-established procedure in dentistry and generally carries no major risks. However, some patients may experience bleeding, infection or pain after the procedure. 1. Bleeding: periodontal inflammation will lead to gums and other periodontal tissues congested and swollen, in the process of scraping surgery if the operation is not appropriate will damage the gums and other periodontal tissues, which will bleed a lot of bleeding risk. 2. Infection: Periodontal scraping may introduce bacteria and other inflammatory substances into the deep periodontal tissues, which may cause periodontal abscess or maxillofacial interstitial tissue infection and other symptoms. 3. Pain: After periodontal scaling, there will be stress reaction of periodontal tissues, which may cause swelling and pain of periodontal tissues; in addition, the bacteria invade into the dental pulp through periodontal tissues, which will cause symptoms of tooth pain. It is recommended to consult a doctor in time for symptomatic treatment to avoid delaying the condition.