Children normally begin losing their baby teeth from around 6 years of age. From 6-12 years, youngsters have a combination of grown-up as well as baby teeth. By about 12 years, most children have all their adult teeth besides the 3rd molars ( knowledge teeth). There are 32 grown-up teeth. If your kid's primary teeth came late, the adult teeth will most likely be late too. If you're worried regarding kids dentist and your kid's teeth development, see your dental expert.