Compound Chlorhexidine Gargle is usually not used until 24 hours after the tooth has been extracted. Tooth extraction is the most common surgery in oral and maxillofacial surgery, and is a measure for the treatment of focally diseased teeth that cannot be retained after treatment and will have an adverse effect on local or systemic health conditions. After extraction, a gauze cotton roll is usually bitten on the extraction wound to stop bleeding, and a blood clot is formed within the extraction wound, which has the effect of protecting the wound and promoting healing. Patients will also be instructed not to lick or suck the wound with the tip of the tongue, and not to brush their teeth or rinse their mouths for 24 hours, in order to prevent the clot from falling off and causing secondary infections. Therefore, chlorhexidine gargle should be applied after 24 hours of tooth extraction, which has the effect of maintaining oral hygiene and preventing infection. If bleeding, pain and other uncomfortable symptoms occur after tooth extraction, you should consult a doctor in time and standardize the treatment under the guidance of a professional physician to avoid adverse consequences.