Secure Denture Adhesive Secure Denture Adhesive is specially designed for lower dentures but is great for uppers too. Unlike traditional denture adhesives, it is not water-soluble so is not affected by saliva or eating & drinking & can be used by people with a dry mouth or excessive saliva. Just a small amount applied in the the morning will hold your dentures securely thoughout the day & into the night. Secure Denture Adhesive can also be used to ensure that food does not get caught underneath partial dentures. Each 40g tube Secure Denture Adhesive will last between 4 & 8 weeks, depending on the size of the denture & the amount of adhesive which is spread over it.