Conventional adhesives work by thickening saliva to improve suction between the denture and the gum. The dentures hold only by suction. Being water-soluble, these fixatives can dissolve and wash away when you're eating and drinking, causing dentures to slip and slide. Zinc is an important ingredient in making this work. Note: description is informational only. Please read the ingredient label on the product for more information and always consult your health professional with any questions prior to use.