Children usually start shedding their primary teeth from around 6 years of age. From 6-12 years, kids have a blend of grown-up as well as primary teeth. By around 12 years, most kids have all their adult teeth besides the 3rd molars ( knowledge teeth). There are 32 grown-up teeth. If your child's baby teeth came late, the grown-up teeth will most likely be late also. If you're concerned regarding kids dentist as well as your kid's teeth growth, see your dentist.