How long after tooth extraction should the cotton ball be spit out?

The sterile cotton provided by the dentist after tooth extraction is used to apply pressure on the wound to help stop bleeding and promote healing. Generally, it is recommended to remove the cotton 30 minutes to one hour after the extraction. Prolonged pressure may cause local ischemia and impair wound healing. If bleeding continues after removing the cotton, you may use a new sterile cotton ball to apply pressure again. During the recovery period following tooth extraction, it is important to maintain good oral hygiene to prevent infection.