This is also the kind of thing that NCR, ABC and Starecta can correct. Bi-cuspid drop off is what Starecta corrects. After Starecta, one must build up the back teeth with crowns (preferably Lumineers) to keep the skull from dropping and closing up the space between the upper and lower jaw.
'What causes loss of dental height?'. Mike Mew suggests the vertical growth in the face and loss of otherwise natural attractive facial features is caused by mouth breathing. It's because the tongue falls away from the palette (where it rests naturally with nasal breathing) to allow air to pass through the mouth. This lack of vertical support and forward direction encourages a deformed jawline, weak masseteur and temporal muscles and under-development of the whole face, usually including an overbite. Is it possible that it also causes a lack of dental height and therefore postural abnormalities?
Breast feeding an infant is the way to go, as the child will develop correct swallow pattern to begin with. And teaching them to keep the tongue resting UP in the upper palate for correct oral posture.
Look up Mike Mew and correct oral posture and correct swallowing pattern.