Kids usually start losing their baby teeth from around 6 years old. From 6-12 years, children have a mixture of adult and baby teeth. By around 12 years, the majority of children have all their grown-up teeth except for the third molars (wisdom teeth). There are 32 adult teeth. If your child's baby teeth came late, the grown-up teeth will possibly be late too. If you're concerned about kids dentist and also your kid's teeth growth, see your dental practitioner.