A knocked-out permanent tooth is a dental emergency. Knocked-out teeth can be re-implanted in many cases. A permanent tooth that is re-implanted within 30 minutes has the highest chance of success. 1. Collect Teeth or Teeth Fragments Handle teeth carefully because damage may prevent re-implantation. Touch only the crown, the top part of the tooth. Do not touch the root of the tooth. Rinse the tooth gently in a bowl of lukewarm water for no more than 10 seconds only if there i