The star marks tooth number 28.

The star marks tooth number 28.

• A. 31
• B. 28
• C. 4
• D. 18

Answer: (B)

In this question, you’re being tested on the universal tooth numbering system. Numbers 1–32 map to specific teeth: the upper arch is numbered 1–16 from the right to the left, and the lower arch is numbered 17–32 from the left to the right. The star is placed on a tooth in the lower arch on the right side, which corresponds to the lower right first premolar. In this system that tooth is numbered 28, so the star marks tooth 28. The other numbers would refer to different teeth in either the upper arch or other positions in the lower arch, so they don’t match the star’s tooth.

In this question, you’re being tested on the universal tooth numbering system. Numbers 1–32 map to specific teeth: the upper arch is numbered 1–16 from the right to the left, and the lower arch is numbered 17–32 from the left to the right. The star is placed on a tooth in the lower arch on the right side, which corresponds to the lower right first premolar. In this system that tooth is numbered 28, so the star marks tooth 28. The other numbers would refer to different teeth in either the upper arch or other positions in the lower arch, so they don’t match the star’s tooth.