When a team of archeologists recently came across some 15,000-year-old human remains, they made an interesting discovery: the teeth of those ancient humans were riddled with holes. So what causes cavities, and how can we avoid them?

From Mel Rosenberg and TED Ed, with animation by Andrew Foerster. Follow this video with more videos about teeth including this favorite: Straightening teeth with dental braces, an 18 month time lapse. Plus, How Much Sugar Are You Really Eating?

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