Listerine's a brand name for antiseptic mouthwash. Its original formula has notoriously strong flavor, although variations have been released that're marketed as tasting milder. The product's marketed under the slogan "Kills germs that cause bad breath". It was named after Joseph Lister who discovered the idea of antiseptic surgery by killing bacteria. Listerine's one of the most popular mouthwashes sold in the United States. It's currently manufactured and distributed by Johnson and Johnson si… (More on Listerine)