plaque & tartar causing bacteria can be found in the smallest & most difficult to reach areas of your mouth particularly between teeth & below the gum line. these areas cannot be reached by brushing alone. ultradex® interdental tape slides comfortably between teeth to effectively remove plaque & debris above & below the gum line. in addition the anti-bacterial agent has been shown to kill bacteria that can cause gum problems tooth decay & plaque & to also whiten teeth. bacteria cannot become resistant to ultradex & regrowth is inhibited., anti-bacterial coating non-shred tape, 25 meters.