How did two sets become standard for human beings?

You only get 52 teeth in your lifetime: 20 baby teeth, followed by 32 adult teeth. It's not like that for all animals. Some, like rodents, never replace their teeth. Others, like sharks, keep ...

Baby teeth, officially called primary teeth, typically begin their journey into the world when infants reach around six months of age. That first tiny tooth breaking through the gums marks an exciting ...