History of the ODHAEstablished in 1963, the ODHA is a non-profit organization that represents the interests and needs of member dental hygienists in Ontario.One of the largest of the regulated health professions, dental hygiene has been recognized and practised as a profession for over 50 years.ODHA Mission StatementTo advance dental hygienists as primary care providers in the interests of the profession and the public in Ontario.VisionOral health for all Ontarians.