In general: if your child has sustained an injury such as: a severe blow to the head, possible broken jaw, or any injury causing nausea, vomiting, memory loss, or loss of consciousness, take your child to the emergency room immediately.
Find the tooth and only touch the CROWN (top part of tooth), NOT THE ROOT.
If there is any foreign debris on the exposed root surface, LIGHTLY
clean it off with milk or your child's own saliva. DO NOT CLEAN THE ROOT SURFACE WITH WATER.
Holding the crown, place the root back in the socket and have your child bite and hold onto a clean gauze or cloth.
If you're not sure whether the tooth is facing the right way, do not worry. Priority is to get the tooth back in the socket ASAP without it drying out.
If you cannot re-insert the tooth, place the tooth in COLD MILK
and SEE A DENTIST ASAP.
The best outcome is when the tooth is treated within ONE HOUR
of it being knocked out.
Rinse the injured area of any dirt or debris with warm water.
Place an ice pack or cold compress over the injured area.
If a large part of the tooth is fractured, any teeth become loose, OR
you can see pink or red on any part of the tooth that is still in the mouth (see picture), then immediate dental treatment is necessary.
Exposed pulp tissue (nerve and blood vessels) following a large crown fracture.