W.C.
First of all--go to a pediatric dentist!
My son lost his front tooth when he was 2 in a fall. The dentist at that time said "no worries", wrong! We went to a pediatric dentist a year later and he said we HAD to put in a false tooth to hold the shape of the jaw so the secondary teeth would come in straight.
Also get a floride treatment at the new dentist.