Which star-marked tooth number is the smallest?

Which star-marked tooth number is the smallest?

• A. 31
• B. 28
• C. 4
• D. 18

Answer: (C)

In this question you’re using the universal tooth numbering system, where permanent teeth are labeled from 1 to 32. The smallest numbers sit in the upper right corner and increase as you move across the arch and down to the lower left. So, among the star-marked teeth, the one that corresponds to the smallest numeral is the upper right quadrant, second premolar. That tooth has the lowest label in this set, making it the smallest. The other star-marked teeth map to larger numerals, so they are not the smallest.

In this question you’re using the universal tooth numbering system, where permanent teeth are labeled from 1 to 32. The smallest numbers sit in the upper right corner and increase as you move across the arch and down to the lower left. So, among the star-marked teeth, the one that corresponds to the smallest numeral is the upper right quadrant, second premolar. That tooth has the lowest label in this set, making it the smallest. The other star-marked teeth map to larger numerals, so they are not the smallest.