What it is: A whitening additive that offers an extra boost to your water-flossing routine. What it does: The whitening-concentrate drops gently whiten teeth while supporting healthy gums. The formula's naturally flavored with mint and features soothing aloe and sloe fruit juice to help heal the gums. How to use: Simply fill your water-flosser tank with water and add a full dropper of the whitening drops. Choose your mode and floss for a whiter, brighter smile. Use daily as part of your oral care routine.