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[email protected] Numbers displayed above are based on latest data collected. For more information visit www.intechopen.com 16 The Role of the Oral Health Therapist in the Provision of Oral Health Care to Patients Across All Ages Hanny Calache1,2 and Matthew Hopcraft3 1Dental Health Services Victoria, 2La Trobe University, 3University of Melbourne Australia 1. Introduction This chapter will describe the role and evolution of the scope of clinical practice of dental hygienists, dental therapists and oral health therapists. These three groups of allied oral health professionals are playing an increasingly important role in the provision of oral health services and it is therefore important to understand how they are utilised as part of the dental team. Historically, the dental hygiene profession originated in the early 1900s in the US, followed by Norway, 1924; United Kingdom, 1943; Canada, 1947; Japan, 1948; and Australia, 1971 (Johnson, 2009). Dental hygienists predominantly provide health education, preventive, periodontal and orthodontic auxiliary services to people of all ages. Dental therapists were introduced in New Zealand in 1921 to provide basic preventive and restorative dental care for children in the School Dental Service.