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Which one of the following correctly represents the normal adult human dental formula?

1. 3 1 3 1 / 3 1 2 1
2. 2 1 2 3 / 2 1 2 3
3. 2 1 2 3 / 3 1 2 3
4. 3 1 3 3 / 3 1 3 3

Correct answer: 2 1 2 3 / 2 1 2 3

Solution

The normal adult human dental formula lists the number of each tooth type in one half of the upper and lower jaws. Adults have 2 incisors, 1 canine, 2 premolars, and 3 molars on each side in both arches, so the formula is 2 1 2 3 / 2 1 2 3.

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