It is a normal phenomenon that pain may still be present the day after a tooth is extracted. The degree of pain after tooth extraction varies from person to person, some patients have mild pain, do not need special treatment, some patients have severe pain, need to take oral pain medication under the guidance of the doctor. The reason why there is pain on the second day after tooth extraction is mainly due to the presence of trauma in the local gums and alveolar bone, local tissue damage will stimulate the nerve endings to cause pain; the complexity of the extraction of teeth also requires incision of soft tissues, separation of mucoperiosteal flap, grinding away the bone and other operations, thus destroying the integrity of the tissue, so that the trauma is deep and large, resulting in traumatic injury and maxillofacial swelling, and may be the whole body fever, aches and pains, and other symptoms. The next day after the extraction of the alveolar fossa blood clot stability is not high, easy to loose bleeding, eat too hard, too hot food easily lead to extraction of the wound blood clot loosening off, should be warm and cool state of thin porridge, vegetable soup, milk and other fluid diet.