Your child’s primary teeth are lost at various times throughout childhood and their permanent teeth will begin erupting about age 6 and continue to about age 20. Adults have 28 permanent teeth, 32 if you include the third molars or wisdom teeth.
Knocked-out Tooth: Baby Tooth (Primary): damage to a primary tooth could also harm the permanent tooth underneath it. If the tooth is completely out, do NOT try to put it back in the socket. Clean the area and apply pressure