Attention Deficit Disorder Prosthetic Memory Program

Tooth Universal Numbering System

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Tooth Universal Numbering System - © Attention Deficit Disorder Prosthetic Memory Program

Although it is named the “universal numbering system”, it is also called the “American system” as it is only used in the United States. The uppercase letters A through T are used for primary teeth and the numbers 1 - 32 are used for permanent teeth. The tooth designated “1” is the maxillary right third molar (“wisdom tooth”) and the count continues along the upper teeth to the left side. Then the count begins at the mandibular left third molar, designated number 17, and continues along the bottom teeth to the right side. Each tooth has a unique number or letter, allowing for easier use on keyboards.

Permanent teeth and their assigned numbers (Universal Tooth Numbering System)

Upper right

  1. 3rd molar (wisdom tooth)
  2. 2nd molar (12-yr molar)
  3. 1st molar (6-yr molar)
  4. 2nd bicuspid (2nd premolar)
  5. 1st bicuspid (1st premolar)
  6. Cuspid (canine/eye tooth)
  7. Lateral incisor
  8. Central incisor

Upper left

  1. Central incisor
  2. Lateral incisor
  3. Cuspid (canine/eye tooth)
  4. 1st bicuspid (1st premolar)
  5. 2nd bicuspid (2nd premolar)
  6. 1st molar (6-yr molar)
  7. 2nd molar (12-yr molar)
  8. 3rd molar (wisdom tooth)

Lower left

  1. 3rd molar (wisdom tooth)
  2. 2nd molar (12-yr molar)
  3. 1st molar (6-yr molar)
  4. 2nd bicuspid (2nd premolar)
  5. 1st bicuspid (1st premolar)
  6. Cuspid (canine/eye tooth)
  7. Lateral incisor
  8. Central incisor

Lower right

  1. Central incisor
  2. Lateral incisor
  3. Cuspid (canine/eye tooth)
  4. 1st bicuspid (1st premolar)
  5. 2nd bicuspid (2nd premolar)
  6. 1st molar (6-yr molar)
  7. 2nd molar (12-yr molar)
  8. 3rd molar (wisdom tooth)
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