If the inner side of the lip is pierced by a tooth, it is necessary to carry out the treatment measures such as wound closure and tetanus injection in a timely manner. 1. Cleansing suture: the inner side of the lip knocked through the first with iodine or medical alcohol disinfection, and then for the cleansing suture, according to the depth of the wound to choose a direct alignment suture or layered suture, postoperative saline or compound chlorhexidine gargle solution gargle, to prevent infections, you can take oral amoxicillin or cefixime, and so on. 2. Tetanus shot: after the suture is finished, tetanus toxoid or immunoglobulin can be injected in time to prevent the occurrence of tetanus. After the tooth knocked through the inner lip, go to the hospital in time, according to the depth of the knocked through the professional physician to determine the best suture program, and strictly comply with the medical advice to prevent postoperative infections, which is conducive to the healing of the wound. Medications should be used under the guidance of a physician.