Reveal a stronger, more vivid smile with Crest 3D White Peroxide Mouthwash. The powerful peroxide & fluoride-infused rinse gently whitens teeth in just 7 days while also strengthening weakened tooth enamel to help prevent cavities. Strength Whitening's multi-benefit formulation goes beyond by killing millions of bad breath bacteria, leaving you feeling refreshed with a 100% whole mouth clean without the harsh burning sensation of alcohol. For optimal results, use twice a day - both morning and night.