NBDHE study guide
NBDHE · Work through your exam, one topic at a time.
The National Board Dental Hygiene Examination (NBDHE) is the written licensure examination that dental hygiene graduates typically sit before applying for state or regional licensure in the United States. It is developed and administered through the American Dental Association's Joint Commission on National Dental Examinations (JCNDE), which also oversees the dental (INBDE) and other national board examinations. The NBDHE study guide has 3 sections and about 992 words.
01Scientific Basis for Dental Hygiene Practice
The scientific basis section spans head and neck anatomy, oral histology and embryology, microbiology and immunology, general and oral pathology, pharmacology, nutrition, and biochemistry, and it rewards precision over breadth. Highest-yield clusters: cranial nerves (V, VII, IX, X, XII); the three trigeminal divisions (V1 ophthalmic, V2 maxillary, V3 mandibular, with only V3 carrying motor fibers to the muscles of mastication); arterial supply (maxillary artery giving rise to the inferior alveolar and middle meningeal arteries); lymphatic drainage of the tongue and teeth; periodontal ligament fiber groups and the forces each resists; enamel and dentin composition; and eruption chronology.
342 words, about 2 min02Provision of Clinical Dental Hygiene Services
This domain follows the process of care: assessment (health history, periodontal charting, radiographs, risk assessment), dental hygiene diagnosis, care planning, implementation, evaluation, and documentation. Implementation covers nonsurgical periodontal therapy, instrument selection and adaptation, fluoride and sealants, local anesthesia, polishing, and infection control.
323 words, about 2 min03Community Health and Research Principles
This domain combines epidemiology, biostatistics, research design, and community program planning. Know measures of disease frequency (incidence, prevalence, DMFT/dmft, community periodontal index), study designs (cross-sectional, case-control, cohort, randomized controlled trial), measures of association (relative risk from cohort studies, odds ratio from case-control studies), screening test properties (sensitivity, specificity, predictive values), reliability versus validity, levels of prevention, and the evidence base for community water fluoridation.
327 words, about 2 min