- Universal Numbering System the tooth numbering system most widely used in the United States; it numbers the permanent teeth from 1 (maxillary right third molar) through 32 (mandibular right third molar), working leftward across the maxilla, dropping to the mandible and working back rightward. The primary teeth are denoted similarly, using the letters A through T. See illustration at tooth number, under number.
Medical dictionary. 2011.
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