Introduction

The Integrated National Board Dental Examination (INBDE) replaced the National Board Dental Examination (NBDE) Parts I and II as the single licensure examination for dental students in the United States. The NBDE Part I was discontinued on July 1, 2020, and the NBDE Part II was discontinued on August 1, 2022. The INBDE, administered by the Joint Commission on National Dental Examinations (JCNDE), launched in August 2020 as a single, integrated exam that tests foundational biomedical and clinical sciences together rather than in isolation. This comparison covers the key differences between the old two-part NBDE system and the current INBDE.

Comparison Table

Key Differences

Structural Change: Two Exams to One

The most significant change is consolidation. The NBDE required students to sit for two separate multi-day exams years apart. The INBDE combines everything into one exam, typically taken after the second or third year of dental school. This reduces the total number of test questions across the two exams (800 total for NBDE) to 500 for the INBDE, though each INBDE question may be more complex due to integration.

Integration vs Separation

• •NBDE separated basic sciences (Part I) from clinical sciences (Part II). Students could focus narrowly on each domain.
• •INBDE integrates basic and clinical sciences, requiring students to apply foundational knowledge to clinical scenarios. A single question might test pharmacology knowledge in the context of a restorative dentistry case.

Clinical Reasoning Emphasis

The INBDE places greater emphasis on clinical decision-making, patient management, and interdisciplinary thinking. Questions are more likely to present clinical vignettes requiring integration of multiple knowledge areas, rather than straightforward recall.

Cost Savings

The INBDE is generally less expensive than taking both NBDE parts. Students save approximately $300–500 compared to the old two-exam system.

Difficulty Perception

Candidates and educators have noted that the INBDE’s integrated approach can feel more challenging for students who prefer to compartmentalize knowledge. However, the pass rate (~87–91%) is similar to the combined NBDE pass rates. The exam is pass/fail only, reducing competitive scoring pressure.

Study Resources Transition

Many legacy NBDE study materials (Dental Decks, First Aid for the NBDE) have been updated for the INBDE. Newer resources specifically designed for the INBDE include online platforms and video-based review programs.

Which Approach Was/is Right for You?

For current dental students (INBDE is your only option):

• •Start integrating basic and clinical science study early
• •Use INBDE-specific practice questions that emphasize clinical vignettes
• •Focus on understanding concepts rather than memorizing isolated facts
• •Take advantage of the pass/fail format — aim to pass, not to “score high”

For those who completed NBDE (legacy):

• •Your NBDE pass remains valid for licensure purposes
• •No need to take the INBDE if you already passed NBDE Parts I and II
• •Some states may have specific timelines for when boards must be completed

Sources

• •Joint Commission on National Dental Examinations (JCNDE) — jcde.org
• •American Dental Association (ADA) — ada.org
• •JCNDE INBDE Guide — jcde.org/inbde
• •ADA Education Resources — ada.org/education
• •Dental student forums and candidate experience reports