Accidental child tooth loss

My 4 yr old son fell while on our wood floors on Friday.  He hit his mouth and his top right front tooth came out, root and all.  We had heard you could try to place the tooth back in, but the gum in front of the tooth was gone.  It had no support to hold it in.  We are concerned about his adult tooth coming in and also about the gum healing properly.  We are calling a dentist tomorrow morning.  Is their anything we need to be prepared for?  Can your gums scar?  The trauma to his gum is pretty severe.  

[JP848]

Baby teeth usually can't be replaced once they fall out. Being without it shouldn't affect the erupting of the adult tooth in that area, which should come in a year or two.  The gums heal really well, so scarring shouldn't be a problem. It's good you are taking your son to the dentist for an examination of the site.