Not including false teeth; A human has two sets of teeth in their lifetime.

The statement is true because a human being typically has two sets of teeth in their lifetime. The first set, known as primary or baby teeth, usually starts to appear around 6 months of age and is eventually replaced by a second set, known as permanent teeth. The process of losing primary teeth and developing permanent teeth typically occurs during childhood and early adolescence. Once the permanent teeth have fully emerged, they remain in the mouth for the rest of a person's life, barring any dental issues or interventions. Therefore, a human commonly has two sets of teeth in their lifetime, excluding false teeth.