Sold for $149 on Amazon. Box never been opened. Clinically proven to be up to 50% more effective as traditional string floss and up to 80% more effective than Sonicare Air Floss for improving gum health Proven in laboratory tests to remove up to 99.9% of plaque from treated areas with a 3-second application Clinically proven up to 3x as effective as string floss for cleaning around braces with the Orthodontic Tip.