After tooth extraction, it is not necessary to give a hangnail for 3 days. Generally, whether to give a hangnail after tooth extraction should be decided according to the size of the trauma of the patient’s specific tooth extraction and the patient’s own individual situation. Healing. For more traumatic tooth extractions, such as the extraction of ambiguous wisdom teeth, which involves incision, flap, bone removal, etc., postoperative medication should be applied symptomatically, but it is necessary to check whether the patient needs to be given a hangnail according to the patient’s eating condition. If the patient does not have a big problem with eating, there is no need to give an injection.