Kids generally start shedding their primary teeth from around 6 years old. From 6-12 years, youngsters have a mixture of grown-up and also primary teeth. By about 12 years, many kids have all their adult teeth with the exception of the 3rd molars ( knowledge teeth). There are 32 adult teeth. If your youngster's primary teeth came late, the grown-up teeth will possibly be late also. If you're concerned about kids dentist and your kid's teeth advancement, see your dental expert.