The star marks tooth number 20.

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Multiple Choice

The star marks tooth number 20.

Explanation:
Understanding this question hinges on how teeth are numbered in the universal system. In that system, teeth are numbered 1 through 32, starting at the upper right third molar and moving clockwise around the arches to finish at the lower right third molar. The star marks the lower left second premolar, which is the 20th tooth in this sequence. Therefore, the tooth indicated is the one numbered 20 in the universal system. Other numbers would correspond to different teeth and would place the star elsewhere.

Understanding this question hinges on how teeth are numbered in the universal system. In that system, teeth are numbered 1 through 32, starting at the upper right third molar and moving clockwise around the arches to finish at the lower right third molar. The star marks the lower left second premolar, which is the 20th tooth in this sequence. Therefore, the tooth indicated is the one numbered 20 in the universal system. Other numbers would correspond to different teeth and would place the star elsewhere.

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