Biotene Dry Mouth Mouthwash contains four different types of enzymes that will help stimulate saliva flow and help fight oral bacteria. It is an alcohol free mouthwash, that contains xylitol, which is a well known inhibitor of bacterial growth. In addition, it also contains zinc gluconate, which has been shown to help prevent plaque and tartar build-up, as well as reduce metallic or sour tastes in the mouth. Biotene mouthwash is very gentle to the mouth. It tastes sort of sweet and has a very light minty flavour. Biotene products are now recommended by many health professionals and have been shown to be very effective to treat xerostomia.