Just like natural teeth, dentures wear down over time. Your mouth and jaw experience change over time as well, so your dentures may become ill fitting. It is wise to see your denturist at least once a year to ensure your dentures continue to fit well and work properly. In most cases and with optimum care, dentures should last between 5 and 10 years, but may require adjusting or relining within that time frame. Being proactive with denture care is always more effective than waiting until you have a major problem and trying to backtrack.