Size:33.8-Ounce Bottle Product Description Give your mouth that long-lasting, dentist-clean feeling with Listerine Ultraclean Arctic Mint Antiseptic Mouthwash. Clinically proven to kill the germs that cause bad breath, plaque, and gingivitis, Ultraclean provides the same great benefits as Listerine Original Antiseptic with an added anti-tartar ingredient for cleaner, brighter teeth. When used twice daily for 30 seconds, the refreshing Arctic Mint flavor combined with Listerine 's EverFresh technology will keep your breath freshs. Amazon.com Fights Biofilm Germs that Brushing Leaves Behind Did you know that even after brushing, there are millions of stubborn germs left in your mouth? These germs build up and form a sticky layer called biofilm that covers every surface of your mouth, and can lead to the gum disease gingivitis.