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 healthy gums Kills germs above and below the gum line to keep gums healthy. 5. Keep teeth white Helps prevent tartar build up to help keep teeth naturally white.