If you have a knocked-out tooth, the first thing to do is to clean it if it's dirty. Gently lick the tooth or rinse it with water. If you can, try to put the tooth back in its socket (adults only, never try to reinsert a baby tooth). Bite down on a tissue to keep the tooth in place.
If you can't put the tooth back in its socket, place it in a glass of milk or carry it in your mouth between your cheek and gums. Do not put the tooth in water. It's important to seek emergency dental care if you have a knocked-out tooth. If the tooth can't be re-implanted, your dentist may recommend a denture as a temporary replacement. Once the socket has healed, you may be able to get a bridge or dental implant.When handling the knocked-out tooth, be sure not to touch the roots.
If it's dirty, rinse it gently with water and avoid using antiseptics.