We have two sets of teeth during our lifetime. These are primary (baby) teeth and adult teeth. People typically have 20 primary teeth and 32 adult teeth. It’s also possible to have an extra, or ...

How did two sets become standard for human beings?

Rotten or decayed teeth are teeth that have become damaged by decay or infection. Signs include pain and marks or holes in tooth enamel. Decay usually results from inadequate oral hygiene, but certain ...

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Teeth help animals bite and chew food. Meat-eating carnivores tend to have sharp teeth to sink into their prey, while herbivores tend to have flatter teeth to grind down their plant-based meals. Some ...