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The secret ingredient to really fresh breath? Brush your tongue. "Eighty percent of most bad breath is caused by bacteria on the tongue," says New York City cosmetic dentist Irwin Smigel, D.D.S., president of the American Society for Dental Aesthetics. "Use a tongue cleaner"—aka a tongue brush that resembles a rake with bristles—"for 10 seconds before brushing, and your mouth will feel much cleaner." A regular toothbrush will work too.