The bones in your mouth stabilize your teeth. The upper and lower jawbone can shrink when teeth have been lost or removed. When bone shrinks and there is not enough support, surrounding teeth can become loose and dentures have a difficult time staying in place. Many problems associated with dentures such as poor fit, movement and pain are the result of bone loss. The problem is that the denture were designed to replace the mising teeth, but the missing teeth have caused the bone to shrink. Because of the effect the missing teeth have on the bone, the dentures have a hard time staying in place. This cycle is the cause of immense frustration for many denture wearers.
Dr. James L. Johnson