Corega Ultra Denture Fixative Cream is formulated to give you firmness all day and has a natural flavor that will allow you to enjoy your meals. Corega Ultra Cream does not contain zinc and is free of artificial colors and flavors. Corega Ultra Cream: Maintains firm prosthesis for 12 hours. It forms a seal that helps prevent the entry of food, between the prosthesis and the gum, helping to prevent gum irritation. Improves the fit and comfort of the prosthesis It helps to prevent irritation of the gums.