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