Ask your child to close his or her teeth together and check for a proper relationship of the upper and lower teeth. Especially look for teeth on one side of the mouth that are not in contact when the teeth on the other side are already in proper contact. Look for muscle spasm on the inured side. The child’s jawline may appear distorted. Apply cold compresses to control swelling. If any of these findings are observed, try to keep the jaws from moving by using a towel, tie or handkerchief, then take the child to the nearest hospital emergency room or oral/maxillofacial surgeon as soon as possible. Keep the child still and calm. Make sure that the child can breathe. In case of uncontrolled bleeding or difficulty breathing, immediately call your local emergency medical service (911).