Go natural with Secure Denture Adhesive Secure Denture Adhesive (1x1.4 OZ). 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.)