In old age (Fig.10) the bone becomes greatly reduced in size, for with the loss of the teeth the alveolar process is absorbed, and, consequently, the chief part of the bone is below the oblique line.
In old age (Fig.10) the bone becomes greatly reduced in volume due to the loss of teeth and consequent resorption of the alveolar processes and interalveolar septa. Consequently, the chief part of the bone is below the oblique line.