Denture adhesive can improve the fit of full or partial dentures, but it isn't always necessary. Well-fitting dentures usually do not need help staying in, but many people still use them for a sense of security.
If you feel you need this additional item, there are some questions you should discuss with your dental professional first: Do you need an adhesive to be confident about their fit? Why is the item loose to begin with? Is there another solution that would improve the comfort of your dentures? By visiting your dentist regularly for checkups as well, he or she can offer recommendations regarding how best to improve them along the way.