Finally passed CDT on second attempt — here's what actually worked

by Samantha C. 4 views3 replies
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Samantha C.OP
May 27, 2026

Took my CDT exam back in March and failed by 8 points, which honestly crushed me. I'd been in dental assisting for three years and figured my clinical experience would carry me through without too much structured studying. Wrong. The infection control and radiography sections were way harder than I expected, and I completely blanked on some of the instrument identification questions.

Second attempt I gave myself 10 weeks and actually followed a real plan. I used a CDT study guide that broke things down by topic area, spent the most time on dental materials and sciences (my weakest area), and ran through CDT practice test questions every single night before bed — even just 20-30 questions to stay sharp. Tracked my scores in a notebook so I could see which topics kept tripping me up.

Passed with a 82 this time. The biggest CDT exam tip I can give: don't skip dental sciences thinking your chair-side experience covers it. It doesn't. The written exam cares about terminology and rationale, not just what you do by habit.

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Amanda H.
May 28, 2026
Congrats! I'm sitting for mine in July and this is exactly what I needed to hear. I've been leaning on my work experience too much and honestly avoiding the study guide because it felt overwhelming. The note about dental materials is a wake-up call — that section always feels dry but I guess I can't skip it. Did you do timed practice tests or just work through questions casually?
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Mike_T
May 28, 2026
The infection control questions got me too on my first try. I didn't realize how specific they get about exposure protocols and sterilization cycles. Second time I made flashcards for every sterilization method with the exact temps and times. Felt ridiculous but it worked. Also the CDT practice test banks are really worth it if you can find ones that match the current exam blueprint — some older ones have outdated content.
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Tyler B.
May 28, 2026
Eight points off and you came back swinging — respect. That retake anxiety is real. I studied 6 weeks for my first attempt and passed but it was close. Consistent daily practice questions made the biggest difference for me too, even short sessions. Good luck to everyone else prepping!

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