From the manufacturer's website:
*For use with the Waterpik® Whitening Water Flosser WF-05 or WF-06 models only.
Use one tablet daily in the flosser handle to help remove stains from hard to reach areas, between teeth, and at the gum-line that other products miss. Restores your natural whiteness in four weeks. Clinically proven to remove an additional 25% more stains than brushing alone.
Warning: Keep whitening tablet bottle and tablets out of reach of children and pets. Whitening tablets contain xylitol which may be harmful to pets.
*These statements have not been evaluated by the Food and Drug Administration. These products are not intended to diagnose, treat, cure or prevent any disease.
Ingredients (Inactive): Glycine, xylitol, sucralose, flavor (aroma), copovidone (VP/VA copolymer), sodium lauryl sulfate, dextrin, magnesium stearate, silica