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Mergen Orthodontics is a two-location practice in Iowa City and Coralville, IA, led by Dr.

About Mergen Orthodontics
Dr. John Mergen's Invisalign-heavy practice draws praise for resolving TMJ pain, narrow palates, and overbites other orthodontists had missed.
Mergen Orthodontics treats a high volume of Invisalign and clear aligner cases, and reviews often note results beyond what patients expected, from corrected overbites to widened palates that reduced mouth breathing in young children. Dr. John Mergen is frequently credited with explaining each step of treatment and diagnosing issues, including TMJ and jaw pain, that other providers had overlooked. Scheduling comes up often too, with two locations, on-time appointments, and flexibility for college students and working families.
Summary of 200 patient reviews, September 2019–November 2025, updated September 2026
Mergen Orthodontics is a two-location practice in Iowa City and Coralville, IA, led by Dr.
John Mergen, a Top 1% VIP Diamond Plus Invisalign provider. The practice offers comprehensive orthodontic care including Invisalign, preventive orthodontics, sleep apnea treatment, and braces for patients of all ages.
Treatments offered
Who They Treat
Mergen Orthodontics provides orthodontic treatment for the following age groups:
Technology & Equipment
Mergen Orthodontics uses modern orthodontic technology to deliver precise, comfortable treatment.
Orthodontists at this office
Dr. John Mergen, DDS, MS
NPI verified · no bio or photo on file
Insurance accepted
What patients say
Latest review 11 months ago
What patients praise
Who it suits
Doctors patients mention
| Oct 2023 | 4 |
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| Theme | Praise | Criticism |
|---|---|---|
| Treatment results | 61 | 0 |
| Friendly staff | 38 | 1 |
| The orthodontist | 38 | 0 |
| Scheduling & wait times | 33 | 0 |
| Great with kids | 28 | 0 |
| Clear explanations | 22 | 0 |
| Treatment timeline | 15 | 0 |
| Gentle, comfortable care | 14 | 0 |
Recent reviews from Google
Just had my final visit today after 18 months! Mergen and staff have always been friendly and professional, and I haven't had a bad experience in my time with them. The facility in Iowa City is always so clean. You can trust that they are thorough in their work and that they actually care about the service they provide.
My twin daughters established care with Dr. Mergen at age 9. Their permanent teeth were coming in and were very crowded. I honestly wasn't sure what kind of results he would be able to get because their mouths were so small, but I trusted his process and the outcome was amazing! Our dentist had been concerned that one of the girls was missing a permanent tooth, but Dr. Mergen made space for all the teeth to come it properly. I can't recommend Mergen Orthodontics highly enough.
Out of all of the business I've visited throughout my life, Mergen Orthodontics has been the best experience yet. Dr. Mergen is wonderful! He's kind, understanding, great with children, and a fantastic orthodontist. The staff is also phenomenal. They are all very welcoming, knowledgeable, and accommodating. Oh, and they're incredibly efficient. We've never waited more than a minute or two. Having Invisalign as a young child is a big responsibility. Our daughter did pretty well. However, whenever an issue did arise, everyone was immediately there to help. They all made this a wonderful experience, and I would highly recommend them to everyone!!
Dr Mergen and his staff are professional, friendly, and make the whole experience wonderful. If you feel you have horrible teeth and embarrassed, there is no shaming here. I even lost a tooth due to chemo and they were very professional and even provide next step and contacted my dentist for me. The visits are fast and they are very accommodating to fit your schedule. I would recommend and know you are in good hands with a very experienced staff. P.S. Not to mention my teeth are beautiful again. It's never too late, I'm in my 60's!
I had a great experience with Dr Mergen and his staff. They are so kind, always welcoming, and seemed ginuinely interested in knowing about me and my interests. It made the process go smoothly. They were very thorough in explaining the process and answering any questions I had. I have been getting so many compliments about my new smile.
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