Dental floss is an essential tool for removing bacterial plaque and food debris, which can cause gum problems and bad breath. Use the Expanding Dental Floss Sensodyne to clean areas of the mouth that the toothbrush cannot reach, especially the spaces between teeth and the gum line. The first use may cause slight gum bleeding, which is common. With regular use, your gums will become stronger. The Sensodyne Expanding Floss is different from regular dental floss. It is made of soft, waxed, and compressed fabric fibers, making it particularly thin and able to gently slide between teeth. During use, the Expanding Floss increases its volume, allowing una more thorough cleaning of interdental spaces.