If you have dentures that are over 5 years old and they have not been relined every 2 years, you probably will find that you may have problems with the fit of your dentures. The underlying bone and the denture-bearing surface of your mouth shrink with time. This causes the denture to become loose, resulting in a poor fit. A visit to your Denturist for an oral health examination, will determine the cause and extent of your ill-fitting dentures.