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The International Tooth Numbering System (FDI)

(Figure 1)
  • The first number identifies the quadrant
  • The upper right is Quadrant #1
  • The upper left is Quadrant #2
  • The lower left is Quadrant #3
  • The lower right is Quadrant #4
  • Deciduous teeth (primary teeth) follow the same system: Quadrants #5, #6, #7, #8
  • The second number identifies the tooth
(Figure 2)

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Oral & Maxillofacial Surgery - An Introduction for Registered Nurses Copyright © 2022 by Kathryn Truant is licensed under a Creative Commons Attribution 4.0 International License, except where otherwise noted.

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