The Waterpik Water Flosser Tongue Cleaner Replacement Tip is specially designed to remove bacteria from the tongue that causes bad breath. It uses gentle scraping and flushing action to remove bacteria and sulphur compounds that reside on the tongue, preventing halitosis when used daily. To use, set the pressure on your Waterpik device to its lowest setting while it is turned off. Place the Tongue Cleaner in the middle of your tongue, about half-way back. Turn on your water flosser and pull the tip forward with light pressure. Repeat to clean the desired areas of the tongue, increasing the water pressure if desired. Tongue Cleaner tips should be replaced every 6 months. Each pack contains 2 colour-coded Tongue Cleaner tips for use with Waterpik Ultra, Ultra Professional, Complete Care, Cordless Freedom, Cordless Advanced, Cordless Express, Cordless Plus, and Nano water flossers.