A registered dental hygienist (RDH) is a licensed dental professional who specializes in preventive oral health, typically focusing on techniques in oral hygiene. Dental hygienists provide three types of services to their patients. The first of these is preventive services to promote and maintain good oral health. The second is educational services to help patients develop behaviours that promote better oral heath and help them understand the importance of practicing these behaviours. The third type of service provided is therapeutic services which are treatments meant to stop disease and maintain healthy tissues in the mouth.[1] Local dental regulations determine the scope of practice of dental hygienists. In most jurisdictions, hygienists work for a dentist, and some are licensed to administer local anesthesia. Common procedures performed by hygienists include cleanings known as prophylaxis, scaling and root planing for patients with periodontal disease, taking prescribed radiographs, dental sealants, administration of fluoride, and providing instructions for proper oral hygiene and care.

Dental hygienist work together with dentist to contribute to a co-therapist environment, while providing optimum oral health care to the public. Dental hygienists also offer expertise in their field and provide the dental hygiene data collected during a hygiene visit, to assist the Dentist with a proper diagnosis.  Dental Hygienist do not correct speech issues.