Many patients with periodontitis, after a series of basic treatments such as supragingival scaling (commonly known as scaling), subgingival scaling, root planing, etc., may also need periodontal surgery on individual affected teeth, periodontal surgery is a minor surgery, which can be done on an outpatient basis. Why is it necessary to take the medication two hours before surgery? The blood concentration of most antibiotics reaches its starting concentration in about two hours, which can better prevent postoperative infection. After eating, clean the teeth and do not drink a lot of water. After surgery, alcohol is prohibited for two weeks because of the antibiotics.