See Your Dentist for Relines
Because dentures don’t stimulate your jawbone the way natural teeth do, your body will continue to remove bone from your jaw, which changes the fit of your dentures.
To account for this, your denture might need relining. This adds material to the denture to make up for the lost bone.
If you don’t do this regularly, your dentures lose their fit and are more likely to wear out and break.