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Compounds called polyphenols, found in black and green teas, slow the growth of bacteria associated with cavities and gum disease. Researchers at the University of Illinois at Chicago found that people who rinsed their mouths with black tea for one minute, 10 times a day, had less plaque buildup on their teeth than people who rinsed their mouths with water. What’s more, the size and stickness of their plaque was reduced.