INBDE Day 2: The 140-Question Case Day, Explained

Day 2 of the INBDE is 140 case-based questions in a 4-hour-15-minute session — two sections of 70 questions each, 105 minutes per section, with a single scheduled 15-minute break between them and an optional 15-minute survey at the end. Every question on Day 2 is case-based: there are no standalone questions. Here is the exact structure from the 2026 Candidate Guide:

Where this sits in the whole exam: the INBDE is 500 multiple-choice questions over two days. Day 1 is the long day — 8 hours 15 minutes covering three 100-question standalone sections plus a 60-question case section. Day 2 is shorter but structurally harder in one specific way: it is the only session made of nothing but case work. Across both days, 200 of the 500 questions are case-based, and 140 of them land here.

Two rules govern the day before you answer anything:

• The 7-day rule. Day 2 must occur within 7 days of Day 1, at the same test center — otherwise you retest at your own expense. Book both days as a pair.
• Every question is multiple choice with 3–5 options and one best answer, in the same formats as Day 1 — including negatively worded stems, where EXCEPT, LEAST, and NOT are capitalized.

The name genuinely confuses people — candidates have admitted expecting a physical box of patient documents. It is nothing of the kind. The Patient Box is the on-screen panel of patient information that frames each case: a compact chart presenting the information available at the time of the visit, as the Candidate Guide describes it. Think of it as the patient's record as it stands when you meet them, rendered next to the questions built on that patient.

The Candidate Guide attaches three rules to it, and each one decides answers:

1. It presents the information available at the time of the visit. The case world is the box. You reason from what a practitioner would actually have in front of them at that appointment — not from information the exam has not given you.
2. A blank field means unknown or not available. This is the rule that trips people. The Guide's own example: if no allergies are listed, none are known. You do not treat a blank as an omission to be suspicious of; you treat it as a documented "nothing on record."
3. You are expected to consider everything the box shows. No line of the chart is decoration. The Guide is explicit that all of the box's information is in play.

Put together, the three rules make the Patient Box a closed system: what is in it is known, what is absent is unknown, and nothing outside it counts. Candidates who internalize that before test day stop wasting time second-guessing the chart — and stop importing assumptions the case never stated.

On Day 1's standalone sections, each question is self-contained: read the stem, pick the best answer, move on. A case question works differently — it arrives attached to a patient chart, and the questions built on that patient work from the same chart. Structurally, that changes three things:

• The reading cost is front-loaded and shared. The chart is a fixed reading investment that pays out across every question asked about that patient. A candidate who reads the chart carelessly pays for it several times over; a candidate who reads it well amortizes the cost.
• You will re-consult, and you should plan to. A line of the chart that was irrelevant to one question can be the hinge of the next. A finding sitting quietly in the chart can change which answer is defensible — so returning to the box mid-question is normal technique, not a sign you missed something.
• The chart holds more than any single question needs. Because one record serves several questions — and because the exam requires you to consider everything the box shows — deciding which chart line this question actually turns on is itself part of the tested skill. Expect to weigh information that matters enormously to one question and not at all to another.

One reassurance: Day 2 is not your first contact with this format. Day 1's Section 4 is 60 case questions, so by the time Day 2 starts you have already done a full section of Patient Box work. What changes on Day 2 is dosage — case work is no longer one section among four. It is the entire day.

The arithmetic is simple and worth doing once, before test day:

Two planning consequences fall out of that table.

First, Day 2 is tighter than Day 1's case section — by 15 seconds a question. Day 1's Section 4 gives you 105 seconds per case question; Day 2 gives you 90. If Section 4 felt comfortable, that is not evidence Day 2 will. The only case pacing worth rehearsing is 70 questions in 105 minutes — and you can check your own target pace against every section clock with the INBDE pacing calculator.

Second, the 90 seconds is an average that includes chart reading — so budget at the case level, not the question level. The questions on a patient share one chart, which means the reading cost is shared overhead: a deliberate first read costs more than 90 seconds, and the questions that follow on the same patient cost less. Watching the clock per question will misread how you are actually doing; checking it at case boundaries will not.

Three documented mechanics keep the clock honest:

• The timer pauses while questions load. Loading lag does not count against your 105 minutes, so do not panic-click a slow screen.
• There is no penalty for guessing. If a section clock collapses, answer everything — an unanswered question can only cost you.
• Some questions are unscored experimental items, and you cannot tell which. Do not spend clock deciding whether a strange question "really counts," and do not let one rattling question convince you the section is going badly. Mid-section self-assessment is unreliable by design.

Day 2 is "only" 4 hours 15 minutes — shorter than Day 1 — and candidates regularly underestimate it for exactly that reason. The structural facts say otherwise: it is 140 chart-based questions with a single 15-minute scheduled break, taken within days of an 8-hour-15-minute Day 1. Case questions demand a specific kind of sustained attention — read a chart, hold it in working memory, interrogate it against each question — and Day 2 asks for that attention 140 times without variety, because there are no standalone questions to change the rhythm.

We will not quote you an accuracy-decline statistic — we have not found one specific to the INBDE that we would stand behind, and inventing one would be worse than useless. The qualitative claim is enough, and anyone who has sat a long standardized exam will recognize it: late in a long session, reading gets shallower, re-reading gets more frequent, and careless misses climb. On a day made entirely of reading-heavy questions, that drift is the difference that shows up in Section 6.

The break economics make it sharper. Outside the one scheduled break, the Candidate Guide's rules for unscheduled breaks are strict: no access to your locker or personal items, no eating or drinking, and no leaving the test center. The scheduled 15 minutes is your entire recovery budget for the day — decide in advance how you will spend it (stand up, eat something you stored for the scheduled window, reset), rather than improvising it away.

The good news is that stamina for this format behaves like pacing: it is trainable, and the training is specific. That is the next section.

The principle: rehearse the format at length, not just the content. Knowing the material and being able to do 140 case questions at 90 seconds apiece are different capabilities, and only one of them is built by ordinary studying. A progressive build works:

1. Timed case blocks. Start with short case sets under a timer at the real average — 90 seconds a question. The goal at this stage is a clean case-level rhythm: deliberate chart read, then the questions, with re-consults that are quick and targeted.
2. Full sections. Extend to the real section shape: 70 case questions in 105 minutes, no pauses. This is where pacing errors surface — usually over-reading early cases and sprinting late ones.
3. A full dress rehearsal, at least once. Two 70-question sections with one 15-minute break between them, run as a single sitting. This is the only rehearsal that tests the thing Day 2 actually tests — your accuracy in the second section, not your first hour. Dentovio's 3-month and 6-month study schedules both reserve a case-endurance phase for exactly this build.

On reading order, there are two workable techniques, and this page deliberately presents them as options rather than a prescription:

• Chart-first: read the whole chart once before the first question. Higher up-front time cost, fewer re-reads, and it aligns naturally with the Guide's instruction to consider everything the box shows.
• Question-first: read the question, then go to the chart for what it turns on. Faster starts and less to hold in memory — but more re-reading overall, and it must still end with the full box considered, because that is the exam's own rule.

Run both under a timer during practice and keep whichever holds your accuracy at 90 seconds. The technique that survives the clock is the right one for you; nobody else's preference settles it.

For practice material: JCNDE publishes free official practice questions, and Dentovio's free readiness mock includes original Patient Box case items — the exact format this page is about — with no signup and no recalled content.

Book both days as a pair. Day 2 must occur within 7 days of Day 1, at the same test center; miss that window and you are retesting at your own expense. JCNDE's own advice is to book 60–90 days ahead of your desired dates because seats fill — so treat the two appointments as one booking decision, made together.

Between Day 1 and Day 2, expect nothing and carry nothing.

• No performance signal arrives between the days. Results post to your DENTPIN account within 4 weeks of your exam date, most within 3 — so there is nothing to react to mid-exam, and no basis for re-planning between the days. How Day 1 "felt" is not data; the unscored experimental questions alone make felt-difficulty unreliable.
• Your note boards do not carry over. The two note boards and markers issued each day are surrendered or erased at the end of the day.
• Admission repeats in full. The same two-ID requirement and security screening apply when you check in for Day 2 — the test-day section of our how-to-pass guide covers the full list, from ID name-matching to what you cannot bring in.
• If you can, keep the calendar between the two days free of anything demanding. The 7-day window is a maximum, not a target — booking the days close together keeps the format rhythm fresh, while a longer gap buys recovery after the 8-hour Day 1. Either way, protect the gap you chose.

Know the change economics before you need them. Rescheduling through Prometric costs $50 with 30 or more business days' notice, $70 with 5–29, and $150 with 1–4 — and weekends are not business days. Arriving more than 30 minutes late, or not showing up, forfeits the full testing fee. If a genuine emergency hits between the days, the formal path is a written relief request to testingproblems@ADA.org within 5 business days, with documentation.