NBDE Part I (National Board Dental Examination Part I (legacy, replaced by INBDE)) — Free Online Mock Test

NBDE Part I exam at a glance

NBDE Part I full-length mock tests

Attempt 50 full-length NBDE Part I mock tests, each a distinct question set built on the real 400-question, 960-minute pattern — with instant scoring and section-wise analysis. The first 3 are free.

NBDE Part I section breakdown

The NBDE Part I mock test on Wrexa Edge replicates the real exam's section structure — same names, same question count per section, same time limits. Inter-section breaks are enforced.

• Anatomic Sciences (100 Q)
  100 questions · 240 minutes · ~144 sec/question
• Biochemistry & Physiology (100 Q)
  100 questions · 240 minutes · ~144 sec/question
• Microbiology & Pathology (100 Q)
  100 questions · 240 minutes · ~144 sec/question
• Dental Anatomy & Occlusion (100 Q)
  100 questions · 240 minutes · ~144 sec/question

NBDE Part I scoring & marking scheme

Strategy: NBDE Part I has no negative marking. Attempt every question — blank answers cost you potential marks but cannot pull your score down.

Scale: NBDE Part I (pass scaled 75).

How NBDE Part I is conducted

• Mode
  Standard — practice without proctoring on Wrexa Edge, or enable optional webcam proctoring to simulate test-day conditions.
• Test format
  Linear / fixed-form — every candidate sees the same number of questions per section.
• Backtracking
  Allowed — you can revisit and change answers within a section.
• Mark for review
  Available — flag tough questions and return to them before submitting the section.

NBDE Part I time strategy

With 400 questions in 960 minutes, you have about 144 seconds per question on average. Successful candidates aim for the following pacing on each section:

• Anatomic Sciences (100 Q)
  Target ~144 sec/question. If a question takes more than 216 seconds, mark for review and move on.
• Biochemistry & Physiology (100 Q)
  Target ~144 sec/question. If a question takes more than 216 seconds, mark for review and move on.
• Microbiology & Pathology (100 Q)
  Target ~144 sec/question. If a question takes more than 216 seconds, mark for review and move on.
• Dental Anatomy & Occlusion (100 Q)
  Target ~144 sec/question. If a question takes more than 216 seconds, mark for review and move on.

Wrexa Edge's analytics show your actual time-per-question after every mock so you can spot which sections you're losing time on.

NBDE Part I topics covered

Across the 50 Wrexa Edge variants of NBDE Part I, the following topics appear most often (sample distribution from one variant):

Anatomic Sciences (100 Q)

• Lower Limb · 7
• Abdomen · 7
• Respiratory · 7
• Thorax · 6
• Head & Neck · 5
• Renal · 4
• Path — Cysts · 3
• Pelvis · 3

Biochemistry & Physiology (100 Q)

• Respiratory · 12
• Vitamins · 8
• Lipid Metabolism · 7
• Molecular Biology · 7
• Renal · 7
• Endocrine · 7
• Lower Limb · 7
• Abdomen · 7

Microbiology & Pathology (100 Q)

• Bacteriology · 16
• Virology · 10
• Neoplasia · 10
• Immunopathology · 5
• Mycology · 4
• Path — Cysts · 3
• Hemodynamics · 3
• Occlusion — Classification · 2

Dental Anatomy & Occlusion (100 Q)

• Occlusion — Classification · 4
• Periodontology — Anatomy · 4
• Periodontology — Microbiology · 4
• Endodontics — Diagnosis · 4
• Endodontics — Irrigation · 4
• Operative — Cavity Classification · 4
• Operative — Composite · 4
• Operative — Cariology · 4

NBDE Part I difficulty calibration

Elite tier. Elite-tier: among the toughest exams in its category. Most successful candidates prepare for 6-12+ months.

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. · Official language: English.

Verified content — Wrexa Edge's NBDE Part I bank has been deeply curated with real exam-aligned content (estimated 100% syllabus coverage).

How Wrexa Edge prepares you for NBDE Part I

• Real test-day interface
  Our vignette skin mirrors the actual NBDE Part I testing software — same timer, palette, tools, and navigation.
• 50 distinct variants
  20000 unique practice questions, each variant a fresh test — not just shuffled options.
• Detailed analytics
  Scaled score, section accuracy, topic-wise heatmap, time-per-question — see where to focus after every attempt.
• Spaced repetition (Notebook)
  Wrong answers and flagged questions flow into an SM-2 spaced-repetition deck so you actually retain what you learn.
• Optional proctoring
  Browser-based face-api detection (no install) — turn it on to simulate a high-stakes environment.
• Free to start
  No credit card. Sign up, pick a variant, and your first NBDE Part I mock starts in under a minute.

NBDE Part I study plan

A phase-by-phase roadmap from your first concept to test-ready. Stretch or compress each phase to fit the time you have before your attempt.

Where NBDE Part I can take you

A strong NBDE Part I result opens up these careers and higher-study paths:

• Healthcare qualification & practice
  A strong result supports the qualification, registration or role you are working toward in your field.
• Career progression
  A recognised step toward further study, specialisation or advancement where your pathway allows.
• Hospitals, clinics & health services
  Opportunities across hospitals, clinics, and health and care organisations.

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 (about 144 seconds per question).

Does NBDE Part I have negative marking?

No — NBDE Part I has no negative marking. Each correct answer is worth 1 mark, so attempt every question.

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 online for free?

Wrexa Edge gives you 3 free full-length NBDE Part I mock tests — with instant scoring, detailed explanations and analytics — plus 47 more with Pro. Start practising in under a minute, no card required.

What is the difficulty level of NBDE Part I?

NBDE Part I is rated Elite difficulty on Wrexa Edge. Elite-tier: among the toughest exams in its category. Most successful candidates prepare for 6-12+ months. 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. · Official language: English.

How long is the NBDE Part I exam?

NBDE Part I runs for 960 minutes total across 4 sections. On Wrexa Edge the timer is enforced exactly as on the real exam — including mandatory inter-section breaks.

What topics are covered in NBDE Part I?

NBDE Part I is split into: Anatomic Sciences (100 Q), Biochemistry & Physiology (100 Q), Microbiology & Pathology (100 Q), Dental Anatomy & Occlusion (100 Q). Each section is timed and weighted separately. 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. · Official language: English.

What tools or aids are allowed during NBDE Part I?

No special tools are required.

Is the NBDE Part I test adaptive?

No — NBDE Part I is a fixed-form (linear) test. Every candidate sees the same number of questions per section.

How many NBDE Part I mock tests does Wrexa Edge offer?

Wrexa Edge generates 50 distinct NBDE Part I variants — each with different question content, not just shuffled options — the first 3 free for everyone and 47 more with Pro. That's 20000 unique practice questions in the real test-day interface.

Is there a free NBDE Part I test series 2026?

Yes. The Wrexa Edge NBDE Part I test series for 2026 gives you 3 free full-length mock tests (50 in total) plus subject-wise and topic-wise tests — instant scoring and detailed analysis, no card required.

Are NBDE Part I previous year question–style papers included?

Every NBDE Part I mock is modelled on the official exam pattern and the style of previous years' papers — the same 400-question structure, sections and marking — so your practice mirrors the real paper you'll sit.

Which is the best free NBDE Part I mock test online?

Wrexa Edge's NBDE Part I mock test replicates the real exam interface, timing and marking scheme, with instant score, section-wise analysis and 50 fresh variants — a strong free choice for 2026 preparation.

Can I take the NBDE Part I mock test on mobile?

Yes. NBDE Part I mock tests run in any browser on mobile, tablet or desktop — no app or download needed. Start on your phone and your progress and analytics sync when you sign in.

What is the NBDE Part I syllabus?

The NBDE Part I syllabus maps to its 4 sections: Anatomic Sciences (100 Q), Biochemistry & Physiology (100 Q), Microbiology & Pathology (100 Q), Dental Anatomy & Occlusion (100 Q). Wrexa Edge's mock tests cover the complete syllabus topic by topic — see the topics-covered breakdown above — so you practise every area at real exam difficulty.

What is the eligibility for NBDE Part I?

Eligibility for NBDE Part I — age, qualification and number of attempts — is set by the official conducting body and can change each cycle, so always confirm the current official notification before applying. Wrexa Edge focuses on realistic NBDE Part I practice: 3 free full-length mocks in the exact exam pattern, ready whenever you are.

When is the NBDE Part I exam and how should I prepare?

Official NBDE Part I exam dates are announced by the conducting body for each cycle — check the latest notification for the current schedule. To be ready, follow a phased study plan and take full-length timed mocks; Wrexa Edge gives you 3 free NBDE Part I mocks with instant scoring so you can track your readiness week by week.

Related exams & practice tests

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Ready to ace NBDE Part I?

Join thousands of candidates practising on Wrexa Edge. Free signup, 50 variants per exam, instant scoring.