Tooth Names and Numbering

  • Dental team members should be familiar with tooth names and numbering. The Universal Numbering System (American System) is commonly used in the United States.

  • The numbers 1–32 are used to describe permanent teeth.
    Tooth #1 is the upper right third molar also known as a wisdom tooth. The tooth in front of that tooth, the second molar is tooth #2. Continue counting each tooth until you reach the third molar on the upper left side, #16.
    #17 is the third molar on the lower left side and continue counting all the way to the lower right third molar, #32.

  • The uppercase letters A through T are used for primary teeth identification.
    A–J are the upper teeth with A being the second molar on the upper right and J being the second molar on the upper left.
    K–T are on the bottom with K being the second molar on the left side and T being the second molar on the right side.