Helps prevent cavities. Strengthens teeth. Removes particles brushing may miss. Cleans and protects. Alcohol free. Listerine Smart Rinse is an anticavity mouthwash that helps protect teeth. It also cleans the mouth beyond brushing alone: Helps prevent cavities even in hard to reach places that brushing may miss. 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.