Post-brush. Helps prevent cavities. Kills bad breath germs. Cleans by removing bacteria. Listerine Smart Rinse is an anticavity mouthwash that helps protect teeth. It also cleans the mouth beyond brushing alone. Kills bad breath germs and cleans by removing food particles and bacteria, for fresh breath and a clean mouth feeling. Tints food particles and bacteria, leaving proof in the sink of a cleaner mouth. Use Listerine Smart Rinse and any toothbrush and toothpaste.