Listerine kills germs that cause bad breath, plaque and gingivitis. It is clinically shown to reduce more plaque than brushing and flossing alone. It also offers 24-hour protection against germs and gives fresh breath. LISTERINE® ANTI-BACTERIAL MOUTHWASH is a clinically proven daily use mouthwash. Used twice daily, in addition to brushing, it kills the germs that cause plaque gingivitis and bad breath that forms and acts in those areas that a toothbrush cannot reach.