Dosmetics Remineralization+ technology uses hydroxyaptite which is a non-toxic naturally occuring form phosphate calcium mineral. Hydroxyapatite is an ideal mineral for teeth and bone repair. Expanding And Thorough Cleaning: We designed our teeth and gum floss uses an expanding design that allows it to seamlessly fit between even the tightest of spaces to expand and help remove built up plaque from between the teeth and gums where your toothbrush can't reach. Textured expanding Floss: Unlike traditional tooth floss that glides between the teeth, our dental floss scrubs between the teeth and gums to help scrub away plaque while being gentle on your gums making our gum expanding dental floss ideal for day to day use.