The upper left second premolar corresponds to which tooth number in the dataset?

The upper left second premolar corresponds to which tooth number in the dataset?

• A. 13
• B. 17
• C. 23
• D. 11

Answer: (A)

In the universal numbering system, teeth in the upper jaw are labeled 1 through 16 from the upper right third molar to the upper left third molar. The sequence on the upper left side starts at the central incisor, then lateral incisor, canine, first premolar, second premolar, first molar, second molar, and finally the third molar as you move toward the back. The second premolar on the upper left is the thirteenth tooth in this system. That’s why the correct option points to the upper left second premolar. The other options correspond to different teeth: one would be the upper left canine, another would be a lower jaw tooth, and the remaining would be a different lower jaw tooth altogether, none of which match the upper left second premolar.

In the universal numbering system, teeth in the upper jaw are labeled 1 through 16 from the upper right third molar to the upper left third molar. The sequence on the upper left side starts at the central incisor, then lateral incisor, canine, first premolar, second premolar, first molar, second molar, and finally the third molar as you move toward the back. The second premolar on the upper left is the thirteenth tooth in this system. That’s why the correct option points to the upper left second premolar.

The other options correspond to different teeth: one would be the upper left canine, another would be a lower jaw tooth, and the remaining would be a different lower jaw tooth altogether, none of which match the upper left second premolar.