Nano features a compact design that is 50 percent smaller than full-size models. It comes with 2 flossing tips, 3 pressure settings, and a reservoir that inverts for compact storage. It removes up to 99.9% of plaque from treated areas and is up to 50% more effective for improving gum health vs. string floss. Waterpik is the #1 recommended water flosser brand, clinically proven and accepted by the American Dental Association (ADA).