Have you ever been nearly knocked over by someone’s extremely bad breath? Nothing repels us more quickly and obnoxiously than a foul odor. The person may have something very important to say, but the fetid stink coming from their mouths is so repulsive we can think of nothing else but to flee!

Americans spend an estimated $3 billion per year on breath fresheners, so bad breath is no minor issue![i] In fact, New York Times health columnist …