The cool mint Listerine formula, with its great minty taste, when used in addition to regular brushing, is clinically proven to significantly reduce the build-up of plaque. For Fresh Breath Cool mint Listerine kills the bacteria that cause bad breath, and is particularly effective against breath problems caused by strong smelling foods and beverages such as onion and coffee. Cool mint Listerine complements daily oral hygiene to leave your breath fresh, your teeth clean and your gums healthy.