NDEB Equivalency · comparison
AFK vs ACJ
two exams, one credentialing path.
If you trained as a dentist outside North America and want to practise in Canada, the National Dental Examining Board (NDEB) runs a three-step Equivalency Process. The Assessment of Fundamental Knowledge (AFK) is Step 1. The Assessment of Clinical Judgement (ACJ) is Step 2. The third step is the in-person National Dental Examination of Clinical Competence (NDECC), administered in Ottawa.
The AFK and ACJ are both written exams, both pass/fail, both set to a re-scaled passing score of 75. But they test different things, at different lengths, on different sittings, at different costs — and they must be written in order. You cannot register for the ACJ until you’ve passed the AFK.
This page summarises both exams against the 2026 NDEB protocols (effective January 19, 2026) and the fee schedule published at ndeb-bned.ca/equivalency-process/fees/. Treat NDEB’s own documents as authoritative; this is an independent reference.
At a glance
Side-by-side comparison.
| Attribute | AFK | ACJ |
|---|---|---|
| Purpose | Tests knowledge of biomedical science and applied clinical science. | Tests ability to formulate a diagnosis, make clinical decisions, and interpret radiographs. |
| Format | 200 single-best-answer multiple-choice items, delivered in two parts in one day. | ~120–150 single- and multiple-answer items, organised in case-based clusters. |
| Length | 4 hours total (two 2-hour parts) with one scheduled break. | 5 hours of exam time (5.5 hours seat-time) with one scheduled break. |
| Sittings / year | Twice a year — February and August. | Twice a year — May and November. |
| Cost (CAD) | $1,000 per attempt. | $1,350 per attempt. |
| Pass mark | Test-equated, re-scaled score of 75. Pass/Fail. | Test-equated, re-scaled score of 75. Pass/Fail. Same methodology. |
| Prerequisites | Equivalency Process application approved by NDEB. | Must have passed the AFK before registering for the ACJ. |
| Scoring | Each item worth 1 point. No penalty for wrong answers — always guess. | Items worth max 1 / min 0. On multi-answer items, one wrong selection zeroes the question. |
| Retake limit | Three attempts maximum. | Three attempts maximum. |
| Results timing | Released within 8 weeks of the examination. | Released within 8 weeks of the examination. |
| Delivery | Prometric centres (Canada, Australia, New Zealand) or paper at select Canadian sites. | Prometric centres (Canada, Australia, New Zealand). Computer-based only. |
Sequence
When to write each.
First, the AFK. The Equivalency Process officially begins when NDEB approves your application. Once approved, you register for the next AFK sitting — February or August. Most candidates allow 8 to 12 weeks of structured preparation between approval and exam day. The AFK is broad: nine blueprint domains covering biomedical science, all major clinical disciplines, plus ethics and evidence-based dentistry. It rewards systematic content sweep and high-volume question practice. You cannot skip it or attempt the ACJ first.
Then, the ACJ. Once your AFK pass is recorded in your NDEBConnect profile, you become eligible to register for the next ACJ sitting — May or November. Many candidates pass the AFK in August and write the ACJ in November of the same year. Others take a longer gap to prepare. The ACJ is narrower (six blueprint domains) but deeper: case-based clusters with patient histories, periodontal charts, and radiographs, scored under different rules including a multi-answer item type where one wrong selection zeroes the question. Plan 8 to 16 weeks of focused ACJ preparation after your AFK pass.
Finally, the NDECC. After the ACJ comes the NDECC — the in-person clinical examination held in Ottawa. The NDECC replaced the Assessment of Clinical Skills (ACS) in 2022 and tests hands-on procedural competence and clinical judgement under exam conditions. It is not a written exam and is outside the scope of this comparison, but you cannot complete equivalency without it. Most successful equivalency timelines, end to end, run 18 to 36 months from application to NDECC pass.
Honest framing
Which is harder?
The NDEB does not publish first-attempt pass rates for the AFK or ACJ. Any number you see floating around online is anecdotal. That said, the two exams fail candidates for different reasons, and it’s worth being honest about both.
The AFK fails breadth. 200 items in four hours across nine clinical and biomedical domains punishes anyone with thin coverage in a subject area. A candidate strong in restorative and periodontics but weak in pharmacology, oral pathology, or biomedical sciences typically finds their overall score dragged below 75 by the weak topics. The AFK rewards even, methodical revision over deep expertise in one or two areas.
The ACJ fails reasoning. The ACJ is shorter on breadth but tests integrated clinical judgement under case-cluster pressure. Candidates who passed the AFK by memorising facts often struggle with ACJ items that require synthesising a case history, a periodontal chart, and a radiograph into a single diagnosis or treatment plan. The multi-answer scoring rule is unforgiving: a single wrong selection on a select-one-or-more item zeroes the whole question, regardless of how many correct answers you also picked.
The practical answer: neither exam is harder in the abstract. The exam that’s harder for you depends on whether your gap is content breadth (the AFK problem) or clinical reasoning under timed case pressure (the ACJ problem). Run a diagnostic on each blueprint before you commit your prep months.
Lumen coverage
Studying for both.
Lumen is built around the published NDEB competency blueprints. Our AFK bank mirrors the 2026 protocol exactly — nine domains, weighted at the official midpoints, with item style that matches single-best-answer multiple choice. We don’t use recalled exam content. Every item is drafted against a published source, peer-reviewed, and signed off by a licensed clinician.
If you are starting the equivalency process, begin with the free AFK diagnostic and the AFK preparation hub. The bank, mocks, and weak-topic dashboards live at /exam/afk. Start with a cold 20-question diagnostic, then sweep content by domain weight before running full timed mocks.
ACJ coverage on Lumen is coming soon. We are calibrating an ACJ bank against the 2026 protocol — six domains, case-cluster format, multi-answer items with the official scoring rules. The blueprint, sample-style questions, and a launch waitlist will be published on the ACJ exam page once the bank is clinician-signed. Create a Lumen account to be notified.
In the meantime, NDEB publishes an ACJ Sample Questions and Answers document (last updated October 2024, linked from the Exam Resources page at ndeb-bned.ca/resources/exam-resources/). It is the closest official approximation of ACJ item style and we recommend working through it once you have passed the AFK.
Frequently asked
Questions & answers.
Who writes the AFK?
Internationally-trained dentists pursuing Canadian licensure through the NDEB Equivalency Process write the AFK as Step 1. Eligibility requires an approved Equivalency Process application. The AFK is for graduates of non-accredited dental programs whose degrees aren't already recognised by the Commission on Dental Accreditation of Canada (CDAC).
Who writes the ACJ?
Only candidates who have already passed the AFK can register for the ACJ. The ACJ is Step 2 of the NDEB Equivalency Process. It assesses clinical judgement, diagnosis, treatment planning, and radiographic interpretation through case-based questions.
Which exam do I write first — AFK or ACJ?
AFK first, then ACJ. The NDEB enforces this order — you cannot register for the ACJ until you've passed the AFK. After ACJ you write the NDECC (the in-person clinical exam in Ottawa) to complete equivalency.
How much do the AFK and ACJ cost?
As of the 2025–26 fee schedule: AFK is CAD $1,000 per attempt, ACJ is CAD $1,350 per attempt. A one-time Equivalency Process application fee of $900 applies before either exam. All fees are non-refundable and quoted in Canadian dollars. See ndeb-bned.ca/equivalency-process/fees/ for the current schedule.
What's the pass rate for AFK and ACJ?
The NDEB does not publish first-attempt pass rates. Anecdotally, the AFK is considered the harder gate for many internationally-trained dentists because of its breadth — it covers nine domains spanning biomedical science to ethics. The ACJ is narrower in topic count (six domains) but tests case-based reasoning, which can be unfamiliar to candidates trained outside Canada.
How many times can I retake each exam?
Both the AFK and the ACJ can be taken a maximum of three times. Failing three times means re-applying to the Equivalency Process (with a re-application fee of $400) before another attempt — at NDEB's discretion. Withdrawals before sitting do not count as an attempt, but a fee applies.
Can I prepare for AFK and ACJ at the same time?
Most candidates prepare for AFK first because they cannot register for ACJ without an AFK pass. Some overlap exists — pharmacology, oral medicine, periodontics, endodontics all appear on both blueprints. But the question style is meaningfully different: AFK is single-best-answer recall and recognition, ACJ is case-cluster clinical reasoning with multi-select scoring. Treat them as related but distinct preps.
Do I need to be in Canada to write AFK or ACJ?
No. Both exams are delivered electronically at Prometric test centres in Canada, Australia, and New Zealand. The AFK is also offered in paper format at select Canadian locations. Only the NDECC — the in-person clinical exam that follows ACJ — requires testing in Ottawa.
Sources
- 2026 AFK Protocol — ndeb-bned.ca/wp-content/uploads/2026/01/2026-AFK-PROTOCOL_Revised.pdf
- NDEB ACJ candidate guide and 2026 protocol — ndeb-bned.ca/equivalency-process/assessment-of-clinical-judgement/
- NDEB Equivalency Process fee schedule — ndeb-bned.ca/equivalency-process/fees/
- NDEB examination dates and locations — ndeb-bned.ca/examination-dates-and-locations/
Independent study tool. Not affiliated with or endorsed by NDEB. Facts are summarised from publicly available NDEB protocols and policy pages, current as of the 2026 protocol effective date (January 19, 2026). Verify all fees, dates, and policies on ndeb-bned.ca before registering — figures are subject to annual review.