Kids normally start shedding their primary teeth from around 6 years of age. From 6-12 years, kids have a combination of adult as well as primary teeth. By about 12 years, many kids have all their grown-up teeth except for the 3rd molars (wisdom teeth). There are 32 grown-up teeth. If your kid's primary teeth came late, the adult teeth will probably be late also. If you're concerned about kids dentist as well as your child's teeth advancement, see your dentist.