Listerine Cool Mint antiseptic mouthwash kills 99.9 percent of germs that cause bad breath, plaque and gingivitis for a fresher and cleaner mouth than brushing alone. Mint-flavored mouthwash is accepted by the American Dental Association (ADA) to be safe and effective for oral care use. Mouthwash comes in a one gallon container with a handy pump for easy dispensing.