Marvis mouthwash features a concentrated formula designed to kills germs and neutralize odor causing bacteria without stripping or irritating your teeth and gums. Xylitol and propolis extract promote good oral hygiene by gently and effectively fighting cavities and gingivitis to leave your mouth feeling clean and your breath fresh. directions. Dilute 1 part of marvis mouthwash in 4 parts of water. Rinse twice a day for 30 seconds after brushing. Warning: Keep out of the reach of children. Do not swallow. Dilute before use.