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What causes bad breath? – Mel Rosenberg

Mel Rosenberg | TED-Ed

View full lesson: http://ed.ted.com/lessons/what-causes…

Halitosis is a curse that has plagued humanity since ancient times. But what causes it, and why is it so universally terrifying?

Mel Rosenberg outlines the basics of bad breath — and what you can do when it strikes you.

Lesson by Mel Rosenberg.

Animation by Andrew Foerster.