What to do if a permanent tooth is knocked out?
Find the tooth. Handle the tooth by the top (crown), not the root portion. You may rinse the tooth, but do not clean or handle the tooth unnecessarily. Try to reinsert it in its socket. Hold the tooth in place by biting on a clean gauze or cloth. If you cannot reinsert the tooth, transport the tooth in a cup containing milk or water. See a dentist immediately. Time is a critical factor in saving the tooth.
