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In all, children have 20 baby teeth - 10 on the top and 10 on the bottom. These teeth act as placeholders for the adult teeth that grow in after the baby teeth fall out.
Your child will lose all 20 of their baby teeth over the course of several years, usually by the ages of 12-13. These teeth will be replaced by up to 32 permanent teeth (28 without wisdom teeth!).As your child loses baby teeth, permanent ones will begin to erupt in their place. With the exception of wisdom teeth, all permanent teeth are usually in by the age of 13.t birth your child has 20 baby teeth that begin to erupt on average around age six months and are usually (but not always) in by the age of 2 Â½. There are 10 teeth on the top and 10 on the bottom. The last baby tooth wonât be lost until around age 12. So it is important to take good care of these baby teeth!