After periodontal flap surgery you need to wait 48 hours before brushing your teeth. Periodontal flap surgery is a routine periodontal surgery, mainly through different surgical incisions to form a periodontal tissue flap, and then turned upward to expose the root and periapical tissues, which is conducive to thorough debridement. Do not brush your teeth and rinse your mouth for 48 hours after periodontal flap surgery to avoid dislodging blood clots from the surgical site, secondary bleeding and infections and other uncomfortable symptoms. Cold compresses can be applied to the affected area within 24 hours after periodontal flap surgery to reduce postoperative tissue edema. Meanwhile, 0.12% or 2% chlorhexidine solution can be used to rinse the mouth as prescribed by the doctor to avoid infection. After the operation, you should pay attention to a light diet, avoid eating too high temperature or hard food, and also prohibit the consumption of alcohol. Wait for about a week after the operation, you can go to the hospital for follow-up to remove the stitches. It is recommended to take care of the affected area according to the doctor’s instructions after periodontal flap surgery, and to consult a doctor if there is any abnormality.