But he'll need your help. Collect the tooth and wrap it in a wet cloth, or place it in a glass of slightly salted water. Best of all is to place the tooth back in the socket if possible, but only if its not dirty and gritty from being on the ground. Bring the child immediately to your dentist's office. Don't waste time because the chances for a successful replantation are best if done within 30 minutes to an hour after the mishap.
Some parents rush their child to the dentist, but in their haste forget to bring the tooth.
And, don't try to clean it yourself - even if it looks messy. The younger the patient, the better the chances of success. Long-lasting results have been disappointing in replanting teeth in adults. It may be worth a try, but bridges and implants are more predictable then.