TMJ diseases, sleep apnea, and other health problem are related to the loss of vertical dimension of occlusion(VDO). Even aging may be due to VDO loss which causing gradual narrowing of air passway. I use loss vs. decrease because VDO loss is the best word to describe the problem, wether it is due to teeth wear out or due to under growth of lower jaw( stress -growth H secretion during night-under growth of lower jaw).
Comment No. 151