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The National Board Dental Hygiene Examination (NBDHE) consists of 350 multiple-choice questions divided into a discipline-based section and a patient case-based section.

Exam Structure and Content

Total Questions: 350 items. Session One: 200 discipline-based questions covering scientific basis, clinical services, and community health. Session Two: 150 patient case-based questions. Passing Score: A scaled score of 75 or higher. Official Source: Review guidelines on the JCNDE NBDHE Hub.

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Top Core Subjects to Master

Periodontology & Process of Care: Focus heavily on clinical assessment, scaling, and treatment planning. Pharmacology & Pathology: Learn common drug interactions, side effects, and oral lesions. Radiology & Community Health: Understand exposure techniques, radiation safety, and public health prevention. Case Studies: Patient cases make up a large portion of the exam; practice applying your foundational knowledge to scenarios.

Recommended Study Tools

Comprehensive Review: Use Darby's Comprehensive Review of Dental Hygiene for outline-style summaries and practice tests. Online Modules: Review structured programs like StudentRDH or the American Dental Hygienists' Association Review. Practice Material: Study via the Mometrix NBDHE Guide for sample questions and test breakdowns.

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