If the tooth is dirty, rinse it carefully in water, but don't scrub. Gently push it back into the socket, then go immediately to your dentist or a nearby hospital emergency room.
Time is a critical factor.
If you can get to a dentist within 30 minutes of losing a tooth, there is a 90 percent chance that it can successfully be implanted. This may mean the tooth needs root canal treatment. Although persistent bleeding is an obvious indication that professional help is needed, sometimes the injury is not as serious as it appears. If you put pressure on the spot, and the bleeding does not stop in a matter of minutes then go to your dentist or a hospital emergency room. Do not force the tooth into the socket.