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The Internation Federation of Dental Hygienists UPWARD With a Global View in All We Do. Home The IFDH Mission The International Federation of Dental Hygienists is an international nonprofit association uniting national organizations of Dental Hygienists Dental Therapists Oral Therapists and Oral Health Therapists. By fostering leadership and collaboration IFDH is the principal advocate for the oral hygiene profession globally and promotes excellence in oral health education research and practice. About IFDH The International Federation of Dental Hygienists was officially formed on June 28 1986 in Oslo Norway.