Youngsters generally start shedding their primary teeth from around 6 years of age. From 6-12 years, youngsters have a mixture of grown-up and primary teeth. By around 12 years, many kids have all their grown-up teeth with the exception of the 3rd molars ( knowledge teeth). There are 32 adult teeth. If your child's primary teeth came late, the adult teeth will possibly be late too. If you're worried regarding kids dentist and your child's teeth development, see your dental professional.