Two injuries require an immediate trip to a pediatric dentist. If a tooth is knocked out, rinse it under warm water, gently push it back in the socket and hold it there or place it in a cup of milk or cool water. Remember to bring the tooth with you! Don’t scrub the tooth or remove attached tissue. For a broken tooth, gently clean the injured area with warm water. Place cold compresses on the face to decrease swelling.
source: the center for pediatric dentistry website