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Updated: July 11, 2025
Even at its best the mouth-passage here is narrowest and called the "isthmus" and nothing must be allowed to make it narrower than it is by nature. The lips never should lie flat against the teeth, since this would muffle resonance. On the other hand, the teeth should not be bared, as this results in a foolish grin. The cheeks naturally conform to the action of the lips.
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