Listerine as a brand is synonymous with fresh breath and healthy teeth. Named after Joseph Lister, a pioneer of antiseptic hygiene in surgery, Listerine has always put hygiene first, since they became the first mouthwash on the American market back in 1914. Today, Listerine remains a leader in the oral hygiene space, and is designed to keep your whole mouth healthy and fresh by killing the germs that cause bad breath.