Why do we grow two sets of teeth?
It might seem odd to replace a complete set of teeth, but your first set of milk teeth has done its job by the time you are five or six years old. Milk teeth have helped you chew for essential nourishment and learn to talk when it's time for your body to house a more extensive adult set of teeth. You lose milk teeth and get adult teeth.
Porque é que temos dois pares de dentes?
Pode parecer estranho substituir um conjunto completo de dentes, mas seu primeiro conjunto de dentes de leite já fez seu trabalho quando você tem cinco ou seis anos de idade.