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While studying bacteria that break down oil spills, a chance discovery by Mel Rosenberg changed the way we understand bad breath. Since then, the halitosis guru has invented a highly successful mouthwash, written children’s stories about halitosis and studied how different cultures tackle bad breath. During talk of teeth, tongues and tonsils, he told Richard Fisher how to keep every breath fresh.

Why spend your career sniffing bad breath?

It’s an intellectual gold mine – albeit a smelly one – and it’s a problem that almost everyone suffers from or worries about. Furthermore, you can learn almost everything you want to know about bacteria from the…

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