Extras

    Video thumbnail: Science Trek D4K: The Web Show: Teeth

    Science Trek

    D4K: The Web Show: Teeth

    When should you brush your teeth?

    D4K: The Web Show: Teeth

    Video thumbnail: Science Trek D4K: Teeth Video Short

    Science Trek

    D4K: Teeth Video Short

    Your smile shows how healthy you are and what kind of food you eat.

    D4K: Teeth Video Short