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Gently work the floss between the teeth toward the gums. Curve the floss around each tooth into a U-shape, and gently slide it under the gum line. Move the floss firmly up and down several times to scrape off the plaque. Popping or snapping the floss in and out between the teeth without scraping will not remove much plaque and can hurt your gums.
WebMD Medical Reference from Healthwise