Listerine stay white 500ml mouthwash 64 of adults in the uk are concerned about teeth discolouration listerine stay white is specially formulated with zinc chloride to prevent tartar build up to fight staining used twice a day listerine stay white is proven to 1 kill germs kills up to 97 of germs left behind after brushing 2 reduce plaque reduces plaque by up to 56 more than brushing alone 3 keep your breath fresh provides up to 24 hours of fresh breath protection 4 maintain h