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Dental floss is either a bundle of thin nylon filaments or a plastic (Teflon or polyethylene) ribbon used to remove food and dental plaque from teeth. The floss is gently inserted between the teeth and scraped along the teeth sides, especially close to the gums. Dental floss may be flavored or unflavored, and waxed or unwaxed. An alternative tool to achieve the same effect is the interdental brush.

Source: wikipedia.org
Photo credit: thedailystar.net