Kills germs that cause bad breath, plaque, and gingivitisnClinically shown to reduce more plaque than brushing and flossing alonenOffers 24-hour protection against germsnKills germs that cause bad breath, plaque u0026 the gum disease Gingivitis. ADA Accepted (American Dental Association). Cool Mint Listerine Antiseptic has been shown to help prevent and reduce supragingival plaque accumulation and gingivitis when used in a conscientiously applied program of oral hygiene and regular professional care. Its effect on peritonitis has not been determined. (Council on Scientific Affairs, American Dental Association.)