If the tooth is loose, gently push the tooth back to its original position, bite the tooth, move the tooth, and call the dentist or go to the emergency room.
For torn teeth, not the root part, the root part (the tooth part below the gums) may damage the cells needed for bone reattachment. If the site can not replace the teeth, please do not let the teeth dry. Put it in a covered container, with milk or saliva. See your dentist as soon as possible - the longer your teeth grow, the more likely your teeth will be preserved.