Kids normally start losing their baby teeth from around 6 years old. From 6-12 years, children have a blend of adult and baby teeth. By about 12 years, many kids have all their grown-up teeth with the exception of the 3rd molars (wisdom teeth). There are 32 grown-up teeth. If your youngster's baby teeth came late, the grown-up teeth will probably be late too. If you're concerned regarding kids dentist as well as your child's teeth development, see your dentist.