Nano Micro-Riser expanding floss is made of a soft micro-fibre thread which expands between teeth due to the mechanical action of flossing. It is coated in our Enamel Care Technology© (hydroxyapatite) as well as naturally occuring xylitol to provide an anti-bacterial effect. It has also been clinically tested to remove up to 40% more plaque compared to other traditional flosses. This high performance floss even works in cases of xerostomia.