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For detection of the extent and degree of severity of periodontal disease the periodontal screening index (PSI) is used. The index allocates a clinical picture and the associated therapy to five degrees of severity. For determination of the PSI index, periodontal probes are used by the dentist. This part of ISO 21672 specifies the designation of the different periodontal probes. General requirements for periodontal probes are specified in Part 1. The International Standard has been prepared by ISO/TC 106/SC 4/WG 8 "Dental hand instruments" (secretariat: ANSI) in collaboration with CEN/TC 55 "Dentistry" (secretariat: DIN). Working Committee NA 014-00-23 AA "Dentalmedizinische Instrumente" ("Dental medical instruments") of NADENT is responsible at DIN.