Are your dentures loose, sore and not fitting properly? If so, then it may be time for a reline. Relines are required for dentures an average of every two or three years and are necessary to improve the fit and function of the dentures. The reason for this is due to the changing shape of the bones in the mouth which will eventually lead to a space between the dentures. A reline is a simple procedure that involves a re-fitting of the dentures and making them fit like new again.