Other Information: Store at controlled room temperature 68-77 degrees F (20-25 degrees C). Cold weather may cloud this product. Its antiseptic properties are not affected. Misc: With everfresh technology. Controls tartar build-up. Kills plaque & gingivitis germs, keeps breath fresh for hours. Advanced formula. Powerful dentist clean feeling up to 3x longer (vs brushing alone). No. 1 dentist recommended brand. Clinically proven. Kills germs by millions on contact. Listerine Ultraclean with Everfresh technology has the benefits of Original Listerine Antiseptic with an added tartar control ingredient. Plus, it provides a dentist clean, fresh feeling that lasts for hours.