WELTIP® Flosser Tips Combine Water Flossing With Xylitol Xylitol does not harm the good bacteria we need for a healthy smile. Xylitol is a natural sweetener that bacteria cannot metabolize. The Plaque Bacteria* absorb Xylitol and starve. You will notice after using our system for a few days your gums feel healthier. We recommend that you brush gently as any plaque is easily removed. *Plaque Bacteria (Streptococcus Mutans) metabolize sugar, excreting acids that destroy enamel, bone and gums. These bacteria thrive in a wet environment with sugar as a food source. You Can Reverse Gum Disease Periodontal Disease, Gingivitis and Gum Recession are caused by Plaque Bacteria. When you water floss with just water, you are spreading this bacteria throughout your mouth. You also risk pushing it deeper into your gum pockets. The Best Water Pick Flosser delivers Xylitol to your gum pockets where the damage begins