Free INBDE practice test
20 board-style questions drawn from all 16 INBDE topics, each with an explanation. The first 10 need no account. When you find a weak spot, every topic below has its own question set (253 questions in all).
- Format
- 500 multiple-choice items — a mix of discrete questions and patient-case-based sets — administered over two testing days.
- Length
- Two days: roughly 4 hours on Day 1 (~200 items) and 5 hours on Day 2 (~300 items).
- Scoring
- Reported as pass / fail. The passing standard is a scaled score of 75; a numeric score is only released to candidates who do not pass.
- Pass rate
- First-time pass rates are high, but the integrated, case-based format reliably catches students who learned facts in isolation instead of in clinical context.
10 free questions, 10 with a free account
During a routine clinical examination, a dentist observes that the mesiobuccal cusp of the patient's maxillary first molar occludes distal to the buccal groove of the mandibular first molar. Which Angle classification of malocclusion does this describe?
During the bell stage of tooth development, a specific sequence of cellular signaling occurs. Which of the following events must happen first to initiate the formation of mineralized tooth structure?
A 50-year-old male with a history of chronic alcoholism presents with swollen, purple gingiva and multiple petechiae on the oral mucosa. The patient's condition is caused by a failure in which post-translational modification of collagen?
A 9-year-old patient presents with several incipient 'white spot' lesions on the smooth surfaces of his permanent first molars. Which of the following microorganisms is most likely responsible for the initiation of these lesions through the production of extracellular glucans?
A 45-year-old male presents with a painless, slow-growing swelling in the posterior mandible. Radiographs reveal a multilocular 'soap-bubble' radiolucency and significant root resorption of the adjacent molars. What is the most likely diagnosis?
A 45-year-old patient with a history of hypertension controlled by propranolol requires an extraction. Which of the following describes the most significant risk when administering local anesthetic with epinephrine to this patient?
A 22-year-old patient presents with a deep carious lesion on the occlusal surface of tooth #19. Radiographically, the decay is close to the pulp, but there is a 1.0 mm thickness of remaining dentin (RDT) and no history of spontaneous pain. Which pulp protection protocol is most appropriate before placing a composite restoration?
A 52-year-old male presents for a routine exam. Radiographs show interdental bone loss in the posterior quadrants extending to the middle third of the root. He has lost 3 teeth due to periodontitis. Probing depths are 5-6 mm. There is no evidence of tooth drifting or masticatory dysfunction. According to the 2017 classification, what is his periodontal stage?
A 24-year-old patient reports sharp pain in the upper right quadrant when drinking cold water. The pain disappears immediately once the stimulus is removed. Clinically, a deep carious lesion is noted on tooth #4. The tooth is not sensitive to percussion or palpation. What is the most likely pulpal diagnosis?
The first 10 are free. 10 more below.
A free account unlocks the remaining 10 questions and their explanations, and lets you add the full INBDE path with spaced review that brings back the ones you miss.
A 55-year-old patient presents for a crown preparation on tooth #30. The tooth has a short clinical crown height. Which of the following preparation modifications would most effectively increase the resistance form of the preparation?
A 45-year-old patient requires the extraction of tooth #19. You perform a successful inferior alveolar nerve (IAN) block. However, the patient experiences sharp pain when you apply a periosteal elevator to the buccal gingiva. Which nerve likely requires a supplemental injection?
An 8-year-old patient presents with the early loss of the mandibular primary second molars due to extensive caries. The dentist explains to the parent that the permanent first molars will likely shift mesially into the 'Leeway space.' Which teeth primarily contribute to the Leeway space in the mandibular arch?
Oral Radiology & Imaging Locked
A dentist is reviewing a set of bitewing radiographs and notices that the images are consistently too dark (high density), although the contrast is acceptable. Which of the following adjustments would most effectively correct this for the next patient?
A 68-year-old male presents for a tooth extraction. His medical history reveals stable angina and a previous myocardial infarction 2 years ago. He reports getting out of breath only when climbing two flights of stairs. What is this patient's ASA physical status classification?
A 52-year-old male presents with a chief complaint of 'a painful bump on my lower right gums.' Clinical examination reveals a parulis associated with tooth #30, which has a large disto-occlusal composite with recurrent decay and a 9mm periodontal pocket on the buccal. Radiographs show a furcation radiolucency. The patient also has uncontrolled Type 2 Diabetes (HbA1c: 9.2%). What is the first priority in the treatment plan?
Head & Neck Anatomy Locked
During a routine dental procedure, a dentist administers a posterior superior alveolar (PSA) nerve block. The patient soon develops a hematoma in the area. Which vascular structure was most likely pierced by the needle?
Dental Anatomy & Occlusion Locked
A mother is concerned that her 8-month-old infant does not yet have any teeth. Which teeth are most likely to erupt first in the primary dentition?
A histologist is examining a ground section of a permanent molar and observes several dark lines extending from the dentinoenamel junction (DEJ) toward the enamel surface, representing rhythmic deposition of matrix. These are most likely:
Biochemistry & Physiology Locked
A patient is diagnosed with primary hyperparathyroidism due to a parathyroid adenoma. Which of the following sets of serum findings is most likely?
Head & Neck Anatomy15 QsDental Anatomy & Occlusion13 QsOral Histology & Tooth Development14 QsBiochemistry & Physiology14 QsMicrobiology & Immunology15 QsGeneral & Oral Pathology18 QsPharmacology & Pain Control20 QsCariology & Operative Dentistry16 QsPeriodontology16 QsEndodontics16 QsFixed & Removable Prosthodontics15 QsOral Surgery & Local Anesthesia18 QsOrthodontics & Pediatric Dentistry14 QsOral Radiology & Imaging14 QsPatient Management, Behavioral Science & Ethics16 QsDiagnosis & Treatment Planning (Integrated)19 Qs