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CHAPTER VIII.
OF THE UNDER JAW.

It is not uncommon to find the lower Jaw projecting too
far forwards, so that its fore Teeth pass before those of
the upper Jaw, when the mouth is shut ;* which is attended
with inconvenience, and disfigures the face.
This deformity can be greatly mended in young people.
The teeth in the lower Jaw can be gradually pushed back
in those, whose Teeth are not close, while those in the
upper can be gently brought forward ; which is by much the
easiest operation.
These two effects are produced by the same mechanical
powers. While this position of the Jaw is only in a small
degree, so that the edges of the under Teeth can be by the
patient brought behind those of the upper, it is in his own
power to encrease this, till the whole be completed; that is
till the grinders meet ; and it is not necessary to go farther.
This is done by frequently bringing the lower Jaw as far
back as he can, and then squeezing the Teeth as close
together as possible.
But when it is not in the person's power to bring the
lower Jaw so far back, as to allow the edges of its fore
Teeth to come behind those of the upper, artificial means
are necessary.

lots.
* Vide Natural History, p.