Which tooth identification system is commonly used in Canada and European countries?

The Federation Dentaire Internationale (FDI) System is the correct choice as it is widely utilized in Canada and various European countries for the identification of teeth. This system assigns a two-digit numbering format to each tooth, where the first digit indicates the quadrant and the second digit identifies the specific tooth within that quadrant. For example, the first digit can denote whether the tooth is in the upper right, upper left, lower left, or lower right quadrant, while the second digit helps to distinguish the individual teeth, from the central incisor to the third molar.

This method is beneficial because it provides a clear, concise, and systematic approach to tooth identification, facilitating effective communication among dental professionals internationally. The FDI System's adoption promotes standardization, reducing confusion and errors related to tooth identification.

In contrast, other systems like the Universal Numbering System, primarily used in the United States, relies on a single numeric sequence for teeth without referencing quadrants. The Palmer Notation Method uses a combination of numbers and symbols that may not be as universally recognized as the FDI System. Lastly, while the ISO System exists, it is typically less common compared to the FDI in terms of dental tooth identification.