When was the last time you saw your denturist? Your face, jaws and tissue change over the years but your dental prosthesis is made of stable and rigid material that will not adapt to these changes. Here are some signs that your dental prosthesis need to be checked. *Problems chewing certain foods, *Thinning lips, sagging mouth or change in facial features, *Prosthesis loose or falling out when speaking or laughing *Discoloration and odor. These changes happen gradually and you may not notice them happening. Your denturist is the most qualified person to tell you when your dentures need to be replaced.