... to help remove and control biofilm where bacteria hide. It not only kills germs more effectivley, the chips will have a freshness that lasts 6 times longer. Biofilm is created by bacteria to hide within... and that can lead to harder-to-remove bacteria growth and chip decay along with a bad-smelling chip... and then you will have to resort to the sandpaper like Don mentioned... Nothing like bringing out the natural whiteness by Biotene Mouthwash.