In the first year after a tooth is lost, 25% of the bone volume is reabsorbed back into the body.
This process continues until potentially only the hard basal bone of the jawbone is left. Dentures accelerate this bone loss process by aggravating the boney ridges where teeth sit, wearing them down.
This loss of bone in the jawbone eventually causes collapse of the facial muscles around the jaw. The height between the tip of the nose and the chin progressively decreases, causing the lower third of the face to collapse. This collapse inwards into the face which also creates excessive wrinkles around the mouth, drooping jowls, sagging skin and thinning lips. The chin becomes more pointed. A person’s appearance can be aged many years as a result.