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The increasing use of computers to store information, together with the increasing necessity for the communication of dental information by wire, printed documents and orally, has required that new basic elements be taken into consideration for drawing up a designation system for teeth. The system described in this International Standard has been drawn up by the International Dental Federation (FDI) and approved by the World Health Organization (WHO) and Technical Committee ISO/TC 106. This International Standard provides a system for designating teeth or areas of the oral cavity using two digits. It also provides a system for designating surfaces of the teeth using letters of the alphabet.