Contact your pediatric dentist immediately. Quick action can save the tooth, prevent infection and reduce the need for extensive dental treatment. Rinse the mouth with water and apply cold compresses to reduce swelling. If you can find the broken tooth fragment, bring it with you to the pediatric dentist.
Contact the pediatric dentist as soon as possible. Do not place the baby tooth back in the socket.
The most important thing to do is to remain calm. Find the tooth and rinse it gently in cool water. (Do not scrub it or clean it with soap -- use just water!) If possible, replace the tooth in the socket and hold it there with clean gauze or a washcloth. If you can't put the tooth back in the socket, place the tooth in a clean container with milk, saliva, or water. Get to the pediatric dental office immediately. (Call the emergency number if it's after hours.) The faster you act, the better your chances of saving the tooth.