National Board Dental Examination Part I (legacy, replaced by INBDE)

NBDE Part I exam at a glance

NBDE Part I section breakdown

• Anatomic Sciences (100 Q)
  100 questions · 240 minutes
• Biochemistry & Physiology (100 Q)
  100 questions · 240 minutes
• Microbiology & Pathology (100 Q)
  100 questions · 240 minutes
• Dental Anatomy & Occlusion (100 Q)
  100 questions · 240 minutes

Sample question

Start the full test → to attempt 400 questions across 4 sections.

Frequently asked questions

What is the NBDE Part I exam pattern?

National Board Dental Examination Part I (legacy, replaced by INBDE) contains 400 questions across 4 sections: Anatomic Sciences (100 Q), Biochemistry & Physiology (100 Q), Microbiology & Pathology (100 Q), Dental Anatomy & Occlusion (100 Q). Total duration is 960 minutes.

Does NBDE Part I have negative marking?

No — NBDE Part I has no negative marking. Each correct answer is worth 1 mark.

How is NBDE Part I scored?

Scaled score range: 0 to 100. NBDE Part I (pass scaled 75).

How can I practise NBDE Part I for free?

Wrexa Edge offers free full-length NBDE Part I mock tests with instant scoring, detailed explanations, and 50 distinct variants. Sign up for free at Wrexa Edge and start practising in under a minute.

What is the difficulty level of NBDE Part I?

NBDE Part I is rated Elite difficulty on Wrexa Edge. Historical US dental board (last administered 2020 — kept for licensure equivalency abroad). 400 MCQ over 1.5 days covering Anatomic Sciences, Biochemistry/Physiology, Microbiology/Pathology, Dental Anatomy & Occlusion. Pass at 75 scaled.

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