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Which system is used for tooth identification internationally?

  1. Dental Research Initiative

  2. FDI System

  3. American Dental Association System

  4. World Dental Federation

The correct answer is: FDI System

The FDI System, known formally as the FDI World Dental Federation notation or the ISO system, is the recognized international standard for identifying teeth. It utilizes a two-digit numbering system for both dental arches and individual teeth, making it applicable in various countries around the globe. The first digit indicates the quadrant of the mouth, while the second digit indicates the specific tooth within that quadrant. This system is highly favored for its simplicity and clarity, facilitating communication among dental professionals worldwide. In contrast, the other options either represent organizations rather than standardized tooth identification systems or are primarily used within specific regions, lacking the international recognition and applicability of the FDI System.