In the U.S., the Commission on Dental Accreditation (CODA) requires that dental schools use competency-based assessments and standardized levels of proficiency to ensure that students are prepared for patient care after graduation. No such comprehensive standardized preclinical testing is required in the CODA standards. The aim of this study was to determine the use of preclinical competency assessments for students transitioning from preclinical to clinical education in North American dental schools and respondents' perceptions of the need for standardization in preclinical testing. An electronic survey was sent to the academic deans of all 76 U.S. and Canadian dental schools in July 2018 asking if the school used competency exams to assess preclinical students prior to entering patient care and, if so, about the type of tests and disciplines tested, student remediation, and reasons for revisions. The survey also asked for the respondents' perspectives on potential preclinical assessment standardization. Respondents from 28 U.S. and two Canadian schools participated in the survey, for a 39.5% response rate. The majority (92.3%) of respondents said their school considered preclinical competency assessments to be good indicators of students' readiness for transitioning into patient care, yet 40.0% reported their schools had no comprehensive preclinical testing, and 13.8% had no preclinical testing in endodontics, periodontics, prosthetics, or restorative dentistry. Regarding type of comprehensive preclinical assessment used, 71.4% reported using typodont-based exams, 46.4% used written comprehensive exams, and 42.9% used objective structured clinical examinations (OSCEs); respondents could select all that applied on this item. Of the respondents whose schools had preclinical competency assessments, 72.4% had a review mechanism in place to evaluate its effectiveness. Overall, this study found that 60% of the participating schools had some form of preclinical testing, but there were no agreed-upon competencies to determine preclinical dental students' readiness for safe patient care in their clinical education.