The best way to preserve a PERMANENT  TOOTH that has been knocked out is to put it back into its socket as  QUICKLY  as possible.  Re-implantation is BEST AT THE SITE OF THE ACCIDENT within 15 minutes to ensure a favorable outcome. You still must take the patient to  a dentist. If it’s not possible to re-implant the tooth the next best option is to carefully pick up the tooth by the crown (avoid touching the root) and put the tooth in a cup of saline solution or fresh cold milk, and get to a dentist as soon as possible. For more information please click on the link below, www.saveatooth.com.