Tooth Quadrant Numbers. The number assigned to the gums describes how deep the gaps are between your teeth and your gums. So the lower the number, the smaller the gap.
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Canine (eye tooth / cuspid) 12: In this, the first number refers to the quadrant and the second number to the tooth within that quadrant. This term is to help professionals map out the mouth by splitting the mouth into 4 sections (aka quads).