CDC 4N051 Aerospace Medical Practice Exam

A person develops a total of 20 primary teeth, also known as milk or baby teeth, which eventually fall out and are replaced by permanent teeth. The standard number of permanent teeth, including the third molars (wisdom teeth), is typically 32. To find the difference in the number of primary teeth and permanent teeth, you subtract the number of primary teeth (20) from the number of permanent teeth (32), resulting in a difference of 12.

This difference highlights the developmental transition from primary to permanent dentition, where children start with fewer teeth, which are gradually replaced as they grow, leading to a complete set of permanent teeth in adolescence or early adulthood, including the potential for additional teeth if they have wisdom teeth.