Human Tooth Development: Primary, Permanent & Supernumerary Teeth

Humans naturally develop two sets of teeth: primary (baby) teeth and permanent (adult) teeth. Primary teeth typically erupt around 6 months of age and are usually all present by age 3. Permanent teeth begin replacing primary teeth around age 6, with the full set (including wisdom teeth) usually complete by age 21. In rare cases, supernumerary (extra) teeth may develop anywhere in the mouth, varying in size and shape. These are often removed by a dentist to prevent crowding and other dental complications.