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.
河豚的上下颌的牙齿都是连接在一起的，好像一块锋利的刀片。
Puffer fish of the upper and lower teeth are connected together, as if a sharp blade .
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