Kids usually begin losing their baby teeth from around 6 years old. From 6-12 years, kids have a blend of adult and baby teeth. By about 12 years, a lot of children have all their grown-up teeth with the exception of the third molars (wisdom teeth). There are 32 adult teeth. If your child's baby teeth came late, the adult teeth will probably be late as well. If you're concerned concerning kids dentist and your child's teeth development, see your dental professional.