People just love its refreshing cool mint flavour as well as its germ-killing power. Listerine Cool Mint is not only a germ killer but also a people pleaser. It's bold tingle has been America's favorite for years. Just 30 seconds of rinsing, twice a day. Antiseptic Mouthwash. You’ll get 24-hour protection with clinically proven health benefits.The power to kill germs that lead to bad breath, plaque and gum disease. It has 21% greater gingivitis reduction than merely brushing and flossing alone. Listerine Coolmint is greater reach than brushing and flossing alone—with 100% coverage on teeth, between teeth and along the gum line. It can reduce 52% more plaque than brushing and flossing alone.