Best free resources for ADEX prep in 2026 — compiled list

Great list. I'd add: LinkedIn Learning has some dental-related courses that overlap with cert content, and if you have a library card many libraries give free access to it. Also check if your local library has access to O'Reilly or similar — tons of technical content there.

The official candidate guide is something a lot of people skip but it literally tells you the topic weighting and domain breakdown. It's the roadmap for your study plan. Never skip it.

For ADEX - Dental Hygiene Exam specifically, I found the PracticeTestGeeks explanations were detailed enough that I didn't need to buy a separate study guide. The combination of doing the practice questions + reading every explanation (for both right and wrong answers) covered most of the content I needed.

Just wanted to drop a quick update since I've been lurking this thread for weeks. Took a full practice test last night and scored a 74, which honestly wasn't where I wanted to be but it's way better than the 61 I got two months ago so I'll take it. The radiology section still kills me every time.

Planning to sit the real exam on July 18th so I've got about six weeks left to grind. If you're in the same boat just keep doing timed practice runs, that's what's moved the needle most for me. Good luck everyone.

Honestly I almost didn't bother with this thread because I was convinced I'd never pass. Three failed attempts will do that to you. But I kept seeing PracticeTestGeeks mentioned and finally caved around month four of studying. The explanations actually told you why the answer was wrong, not just what the right one was, and that made a huge difference for me. If you search for adex dental hygiene exam on there you'll find a solid set of questions that felt pretty close to the real thing.

I passed on my fourth try last March. It wasn't magic, it was just finally finding practice questions that didn't feel like they were written by a robot. Don't give up if you're in that dark place where you think you're the only one struggling. You're not.

Honestly the biggest thing that helped me wasn't finding more practice questions, it was finding ones with good explanations for the wrong answers. I spent way too long early on just memorizing "the answer is C" without understanding why A, B, and D were wrong, and that came back to bite me on the harder questions. The adex dental hygiene exam section on PracticeTestGeeks was where I finally started getting that -- the explanations actually walk you through the reasoning, not just "correct because X."

If you're using any resource that just shows you the right answer, I'd honestly skip it or at least supplement it. You need to understand the mistakes. That's what the real exam is testing -- whether you can reason through unfamiliar scenarios, not whether you memorized a specific fact.

Working full-time as a dental assistant while studying for ADEX was rough, I won't lie. I squeezed in maybe 30-45 minutes on my lunch break and another hour after my kids went to bed. Wasn't glamorous but it worked. The key for me was being really consistent instead of trying to cram big sessions in on weekends that never actually happened.

If you're in the same boat, don't try to tackle everything at once. I'd pick one topic area, do a practice set, review what I got wrong, then move on. That rotation kept it manageable without burning out. The explanations on the practice questions helped a lot because I didn't have time to go back and re-read entire textbook chapters every time I missed something. Slow and steady honestly got me there.