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Arch Dental is a family and cosmetic dental practice in Fargo, ND led by Dr.

About Arch Dental
Dr. Derek Harnish's personal follow-up calls after procedures and a bright, tech-equipped office set the tone for families juggling several kids in treatment.
Arch Dental is a general dental practice in Fargo that also offers Invisalign, traditional braces, clear aligners, and TMJ treatment. Reviews point to a modern, well-equipped office with plants, music, and up-to-date technology, and many mention Dr. Harnish personally checking in the day after procedures and considering options beyond just the teeth. The practice also comes up often among families managing multiple children's dental care at once, and several reviews note comfort touches like blankets, noise-cancelling headphones, and nitrous oxide for anxious patients.
Summary of 168 patient reviews, December 2014–April 2026, updated September 2026
Arch Dental is a family and cosmetic dental practice in Fargo, ND led by Dr.
Derek Harnish. The practice offers comprehensive dental services including Invisalign, restorative dentistry, cosmetic dentistry, and whole-health solutions such as TMJ treatment and sleep apnea management. They serve patients of all ages with an emphasis on patient empowerment and holistic care.
Treatments offered
Who They Treat
Arch Dental provides orthodontic treatment for the following age groups:
Technology & Equipment
Arch Dental uses modern orthodontic technology to deliver precise, comfortable treatment.
Orthodontists at this office
Dr. Derek Harnish, DDS
NPI verified · no bio or photo on file
Insurance accepted
What patients say
Latest review 6 months ago
What patients praise
Things to know
Who it suits
Doctors patients mention
Orthodontic care in reviews
A few reviews touch on orthodontic treatment here, including one describing a husband's Invisalign care and a decision to hold off on jaw surgery after further evaluation, and another describing a walkthrough of insurance coverage for a corrections treatment plan.
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| Theme | Praise | Criticism |
|---|---|---|
| Friendly staff | 55 | 1 |
| The dentist | 51 | 2 |
| Gentle, comfortable care | 28 | 0 |
| Clear explanations | 26 | 0 |
| Office & technology | 24 | 0 |
| Scheduling & wait times | 11 | 0 |
| Cost, insurance & financing | 7 | 3 |
| Treatment results | 8 | 1 |
Recent reviews from Google
I can’t say enough good things about Arch Dental, from how efficient the scheduling process was from the beginning, to how thorough my dental care has been. Arch Dental makes me feel comfortable at each appointment, to the point that I actually enjoy going! Dr. Harnish and the team are truly great at their craft.
From the very first visit I felt comfortable, informed of what my treatment plans looked like. We are actually moving our entire family to use Arch Dental from here on out. Highly recommend!!!!
Nicole and Dr. Harnish were really fantastic. This is a team of passionate people who treat their patients well. Best dentist I've ever been to.
Called me many months after a visit. The way my insurance is set up I have to pay in full for dental work upfront. Insurance then sends me a check for what was covered. Arch dental didn't charge me the full amount and then called me saying I owed a bill of $139. If they would of had their numbers right and charged me the day I was there it would have been fine. But now I had to pay for something I had done 6 months ago. Very frustrating. If the business under charged that is their fault not mine. I will not be stepping foot back in this place. The work they did also made my tooth hurt for months. I've never had pain from dental work before that lasted longer than a few days.
I seriously can’t recommend Arch Dental enough. I’m a student in the area and dental visits used to make me super anxious, but they completely changed that for me. In just two visits they already have me feeling confident about my smile again. Everyone there is incredibly kind, patient, and explains everything in a way that actually makes sense instead of feeling overwhelming. You can tell they genuinely care about their patients and want you to feel comfortable. If you’re nervous about the dentist or have been putting it off, this is the place to go. So grateful I found them!!!
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