A blood clot the morning after a tooth extraction is usually normal if it has not lasted more than 24 hours; the clot is normal self-coagulation for hemostatic protection. The blood clot will gradually mechanize within 24 hours after tooth extraction, and will be gradually replaced by fibrous connective tissue over the next 3 to 5 days, thus completing the healing process of the soft tissue at the extraction wound. Therefore, it is important to protect the blood clot in the extraction socket to prevent dislodgement and infection. Once infection of the blood clot occurs, it is easy to cause dry socket, which will lead to radiating pain, and prompt medical attention should be sought. Premature shedding of the blood clot is detrimental to tissue healing and can slow down wound healing in soft tissues. Therefore, patients can only brush their teeth and rinse their mouth after 24 hours of tooth extraction. Warm and cold food can only be eaten 2 hours after tooth extraction. After tooth extraction, patients should not lick the wound or suck on it. It is important to follow the doctor’s instructions for good postoperative care after tooth extraction to avoid causing adverse reactions.