NBDE National Board Dental Examination Part I Practice Test

The NBDE Part I is a computer-based exam consisting of approximately 400 multiple-choice questions, administered in four 100-question sections. You have a total of 7 hours and 30 minutes of testing time, which includes an optional 15-minute tutorial and a scheduled 60-minute break. The exam is offered at Prometric test centers year-round by appointment.

The NBDE Part I is scored on a pass/fail basis. A scaled score of 75 or higher is required to pass. The scoring process uses item response theory (IRT) to account for slight variations in difficulty between different exam forms, ensuring fairness. You will receive a score report indicating pass/fail status and performance feedback in broad content areas, but not a specific numeric score if you pass.

Most dental students take Part I after their second year of dental school, following completion of the relevant basic science coursework. Eligibility requires enrollment in or graduation from a dental education program accredited by the Commission on Dental Accreditation (CODA). You must apply through your dental school's administration, which will verify your eligibility to the JCNDE.

The INBDE has replaced the two-part NBDE (Part I & II) for all first-time candidates. As of August 1, 2020, the JCNDE administers only the INBDE. However, the NBDE Part I remains relevant for students who began the testing process under the old system or for certain reporting purposes. Current students should consult their dental school to confirm which examination pathway they are following.

Failing the NBDE Part I prevents progression to NBDE Part II and clinical board exams, thereby delaying graduation and licensure. Most schools have specific policies regarding remediation and retakes, typically requiring a waiting period (e.g., 90 days) before a first reattempt. A history of multiple attempts, while not disqualifying, may be scrutinized by advanced education program admissions committees.