目的：了解上下颌第一磨牙牙釉质及牙本质的厚度。
Objective: To measure the thickness of enamel and dentin of the first molars.
这样可以稳定上下颌，这样骨头就不会收缩使你的脸看起来很老。
It stabilizes the jaw so the bone doesn't shrink and make your face look older.
不同的音是通过舌头和上下颌的微小变动而发出的，但嘴唇不要动。
Different notes are produced through very slight changes in the position of your tongue and jaw. Don't move your lips.
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