Qualifications. Registered Dental Hygienist (RDH) License: Hold a valid RDH license issued by the appropriate state licensing board. Excellent working knowledge of dentistry, dental hygiene procedures, dental patient screening and medical history documentation. Responsibilities. Dental Cleanings: Perform dental cleanings to remove plaque, tartar, and stains from patients' teeth, ensuring their oral health. Gum Health Monitoring: Assess patients' ...