Mark K Nguyen, DDS

I have been going to Dr. Nguyen for the last
5 years and no matter what the issue was he always solved it. Today was no exception.
He was calm, explained what needed to be done. Patti his assistant is wonderful along with Tish at the front desk. I can’t say enough great things about this office. As long as he’s on Orange County I’ll continue to see him.
Terri Sommer

This dentist and the office are ALL very unprofessional and lack Code of conduct!
The do unnecessary X-​rays and when ask to get the records sent to another dentist they give you the run around and keeps saying they don’t have the release of form! Despite of having it submitted 2x!

Great dentist. My wife has major anxiety around dentists, and Dr. Nguyen is a numbing ninja. Staff is friendly and communicative, and you can text to confirm your appointments which is a nice touch.

My family and I have been patients for Dr. Nguyen for several years now, and we recommended to many people. The staff is very friendly and they always offer a warm greeting when you walk in. They are very accommodating to your schedule and work with you. Dr. Nguyen is a class act dentist. Dr. Nguyen has exceptional bedside manner and is a great communicator. He always explains in detail what he’s doing and why and takes his time to answer your questions. He’s very courteous, caring, and attentive. Dr. Nguyen uses the latest technology available for dentistry and as a patient you feel that you are getting the best possible care available. My family and I feel very fortunate to have him and his staff there for our dental care. I would highly recommend his office to anyone!

Outstanding service and care
As a medical practitioner, I am very familiar with the ins and outs of patient care.
Their primary goal is doing what’s right for the patient, not their bottom line.
Insurance issues are secondary and for the most part out of the control of the practitioner.
I would always want someone that does what is right for me and my health. I always felt this was their primary goal.

Just started Invisalign. So far so good:) Dr. Nguyen also filled two cavities. My experience with this office has been great! The office is clean, staff very courteous. Dr. Nguyen has been quite helpful. I just started the Invisalign process so I’ll keep you posted. So far, it’s all been a positive experience.

Very unimpressed with this office. I had a dental emergency when my normal dentist was out of town. They tried to get me to opt for much more services than I needed. I trusted my instinct and only did the bare minimum until my regular dentist returned. Sure enough, after consulting with him I did not need the extra things they tried to get me to do here. In addition, I just received part of the bill ONE YEAR later, after this debacle. Very unprofessional.

I always come out of this office with a smile on my face. Staff is very professional and competent. He and his staff have always remebered me and my boyfriend each visit. His staff have been with him long term. I think it says a lot when a office doesnt have frequent staff turn around. It means a happy staff which relays to good custormer care… I know because I, myself am a Patient Service Rep in the medical field. Dr. Nguyen has always provided me with exceptional chair side manner, has given all my options and ALLOWS ME to decide my course of treatment. I chipped a tooth and was brought in within two days… mind you, THEY DID provide a same day appointed but I could not make a same day due to MY schedule. I am all fixed and the cost very minimal. I’m a returning patient and EVERY experience has been very satisfying. Seeing them in August for my cleaning…

I give 1 star here because he has several Unilocal pages and that makes it confusing.
Also, I STRONGLY question the legitimacy of these positive reviews. For instance:
That doesn’t seem like an unbiased customer (tweaking it for both pages with subtle differences but retaining certain things. Really — both receptionists at both office remember to ask about your puppy??)
Lame. I’m sorry; I didn’t really like my visit with him — but, whatever, maybe some people really do. My bigger problem is when businesses doctor up these reviews because it ruins this site.

I am a chicken when it comes to going to the dentist. Dr. Nguyen and his staff have made me feel very comfortable in all of my visits. Fillings, crowns, etc. are things that have always scared me because of bad experiences in the past. I no longer fear these because of how pain-​free these were with Dr. Nguyen. I truly have never felt the shots he has ever given me to numb my mouth. He has great physical skill with what he does. He is also very accommodating with appointments.
My wife and kids have all had great experiences at his office, as well. We could not imagine ever going to another dentist!

I originally chose to try out Orange Dental Arts because of the close proximity to my work. I made an appointment to come in after 5pm on a weekday for a routine cleaning and exam. I had not been to a dentist in a few years and was hesitant to try out a new place. The hygienist was fine… nothing negative to say, but nothing special either. Dr. Nguyen performed the exam after the cleaning and it was painful! He poked and prodded at my gums and teeth. He was very rough with the instruments and kept calling out gum pocket depths and teeth numbers to the hygienist without telling me what was happening at each step. Terrible bedside manner! After the exam, he told me that in order to fix my periodontal/​gum issues and my 15 (!!) cavities it would be nearly $ 3,000 out of pocket (after my insurance covered a significant portion). I asked him to show me the issues on the x-​rays and photos that the hygienist took and he refused to do so. I ended up getting a second opinion at another dentist and it turns out that I do not have any gum issues and only had a few extremely small cavities.

Please be very careful when attending this dentist. I did my research before I made an appointment, skeptical about going here because of all the bad reviews, but I had too because my tooth was really bad (infected) and they would take me last min on a sat. So I made my appointment on Friday for Sat at 8AM, which was the only good thing about this dentist is that they are open on Sat!
However, the front desk receptionist was alright, not the friendliest. The hygienist was amazing! She was really nice and considerate! I saw the dentist for like 15 mins. (It was not Dr. Mark Nguyen, it was another dentist in his office) The hygienist did all the work. I have PPO insurance so my visit should have been covered 100 percent. I ended up paying 25 bucks, which wasn’t a big deal considering the amount of pain I was going thru, I did not care how much it cost at the time.
THEN, the office manager came in and told me what I needed done on my tooth. It was going to cost me $ 1500.00!!! I told her I could not afford that much. So she hands me a «Wells Fargo Health» credit application. That is their 3^rd party financing program. After reading thru it, I notice the 27.00% interest rate. HELL NO!!!
After calling my insurance company and asking them questions about the insurance code and how come I still had to pay for prevention treatment. They simply said, «Please go get a second opinion.»
I took my PPO insurance and money and made an appointment with another dentist. My tooth extraction was 100% covered by my insurance (over 200 $ at Dr. Mark’s office). I got a free teeth cleaning (which would have cost me $ 500 something at Dr. Mark’s office.) My consultation for my broken tooth was free ($ 25 at Dr. Mark.)
The new dentist said I do not need a bone graft because I am too young for one. (The bone graft would have cost me 800+ dollars at Dr. Mark’s office.) I mean really!!!
This practice is shady, I feel like they try to sell you or give you unnecessary procedures to make money from you and the insurance company.
One more thing, I got a prescription for antibiotics and pain killers and when I went to CVS pharmacy to get them, my name and home address was wrong on the prescriptions. It was such a hassle. Even the Pharmacist suggested I go to a second dentist and get a second opinion.

Shady practice — stay away! They gave me the run around regarding my insurance and suddenly stopped accepting it after my consultation. Whether or not Dr. Nguyen is competent his practice has major issues as can be noted in the other reviews here.
Check out reviews from his other office which coincidentally now operates under a different name? Must be due to the mix of horrible reviews:

«Dental Group» in Orange, CA.

Dr. Nguyen’s expertise in his field coupled with superb customer service makes his practice among the highest quality in the region. There are always going to be patients who are never satisfied with service and will write bad reviews — I encourage Unilocal readers to take these reviews with a grain of salt as I saw absolutely no indication of shady business practice at Orange Dental Arts.
The staff is friendly, accommodating, and professional. His equipment, based on my experience with other dentists, is the latest and most advanced technology in the industry. Most importantly however, he is honest and fair. I recently moved to the area and had to leave a dentist I had gone to for 25 years. Before I found Dr. Nguyen I went to another practice who told me I had a cavity and tried hard to convince me I needed an immediate filling. They also made a strong attempt to upsell me on other random services. Given my good dental history I felt I needed another opinion. When I went to see Dr. Nguyen he wasted no time in addressing my concerns. He used a special hi-​tech camera to show me a close-​up of the tooth in question and revealed that there was, in fact, no cavity present, but rather a stain. He was very thorough in explaining details of what we saw on the image and specifics of the tooth decay process in general. He saved me hundreds of dollars in unnecessary dental work. I will be going back to Orange Dental Arts as a regular patient.

I can’t say enough about the professiona, l and personal care excellance, from this Dental office. Dr Nguyen is not only a skilled professional, he is totally informative, and gaurantees his excellent work. His entire staff are very friendly. and professional. I feel very lucky to have found these professionals to treat my complicated dental issue. The other bonus is that his pricing is more then reasonalble. Thank you friends. Who knew I would always enjoy a trip to the Dentist.

Dr. Nguyen is the best. I have never liked going to the dentist but had some tooth pain that was HORRIBLE. I have seen dentists in Fullerton and Placentia but everyone I see always hurts me. In fact, I had one dentist who really screwed me up and I had to go to a periodontist to have him fix what the first dentist screwed up on! My experience hasn’t been very good with dentists. A co-​worker of mine said that she drove all the way from Newport Beach to see Dr. Nguyen and that she loves him. Well, I gave it a shot today. I called last minute in severe pain. He got me in immediately, during his lunch break nonetheless! He cleaned and filled the cavity and I didn’t feel any pain! He is a younger dentist and seemed very trustworthy. The staff was very friendly and willing to answer my questions. He personally called me tonight to inquire how I was feeling and to ensure that everything was still alright. Who does that? I’ve never had that kind of personal experience with a dentist before, that’s for sure! I was pleased that no one tried to upsell me on anything either. They only offered what I needed. Although I live over 20 miles from here, I will continue to come to Dr. Nguyen for my dental work for now on. What a great experience!

It had been 5 years since I went to the dentist — I know, I know, spare me the lecture. I had the same dentist my whole life, and he retired. I was either too scared or lazy to try to find a new dentist — so I didn’t. Little did I know, my dental fears were completely unfounded because there are awesome dentists out there like Dr Nguyen at Orange Dental Arts.
They’re in a little charming old craftsman house located a block from the traffic circle in Old Towne Orange. But there’s definitely nothing about this office that says «old». From the minute you step into the gorgeous and modern waiting area, you are greeted by a friendly staff member who addresses me by my first name. The funny thing is… they always remember to ask about my puppy. They greet me like this every time I visit. They know exactly what I’m there for, make me comfortable, and the wait time is always so minimal. I never feel like I’m at a dental office at all. Now that is definitely 5-​star service!!!
When you are escorted to your room area, you are greeted with floor to ceiling windows that overlook the garden. Dr Nguyen’s equipment is state-​of-​the-​art. Everything is digital including the x-​rays. Sit down in the chair and you can pick from a variety of DVDs to watch while having your teeth cleaned, a filling, root canal, etc. I have been so relaxed during these treatments that I’ve dozed off a few times.
I think the most important aspect however is trusting a professional and excellent dentist. I’m so glad I used Unilocal to find Dr. Nguyen. The people who work here truly care and look out for your best interests. Stephanie’s great, and their office assistant, Lauren, is an absolute gem. I now have insurance and Stephanie was able to set me up almost instantly – and I didn’t even have an insurance card, any paperwork, or plan information with me. I was amazed at how they could so quickly and easily set me up, and I did wind up saving some money off of their already do-​able rates. I actually look forward to going to the dentist now! I have had my share of dental work done through out the years where I feel like I’m constantly being upsold on something that I don’t need. I never get the sense that Dr Nguyen is forcing me to have something done – but is honest in his recommendations. And I know that the work he does is of the top notch quality. He is a perfectionist and his work reflects that. Thanks Orange Dental Arts for the excellent care.

In my opinion, Mark K. Nguyen, DDS, is the worst kind of dentist – a dentist who is primarily interested in his own financial gain. I originally saw him on a Dental HMO contract. During my initial visit, he talked me into starting Invisalign (for which he charged me close to $ 5000). After he had a secured a large amount of money form me to start Invisalign he stopped taking my insurance, leaving me without a HMO dentist (he gladly, however, charged me cash for the same procedures that would have been covered under the insurance he stopped taking). To make matters worse, during the Invisalign treatment, I constantly told him that my bite was all wrong and that my chipped front tooth was crooked. After a solid year of wearing Invisalign religiously, Nguyen told me I was finished with the treatment. At that time I complained that my bite was still off and that my front chipped tooth was still crooked. He insisted that my crooked tooth was an «optical illusion» and that I needed veneers on BOTH front teeth (at a cost of another $ 2000) to fix that problem. I became suspicious and went to see another general dentist and orthodontist. Both of these dentists told me that my bite was in fact, seriously off, that my front chipped tooth, was in fact, still crooked, and that I DID NOT need veneers. According to my orthodontist (who does advocate Invisalign treatment on occasion), my particular orthodontic issues made me an unsuitable Invisalign candidate in the first place. And he was highly suspicious that Nguyen was simply trying to cover up his shoddy work with veneers. After I told Nguyen that I had sought a second opinion and that I was going to need braces, he then offered a third Invisalign refinement. I told Nguyen that my orthodontist said I wasn’t a good Invisalign candidate and that I would be needing a refund. Nguyen said he would treat me fairly in that regard. I asked Nguyen to refund half of my money I paid him for Invisalign, but he has flatly refused. Instead, he sent me a copy of the Invisalign contract claiming I breached it (when he knows very well I did not). I have complained about his business practices to the Better Business Bureau and I have lodged a complaint with the California Dental Board. If you were smart, you’d stay far away from Mark K. Nguyen of Orange Dental Arts at 262 S. Glassell Street in Orange, California.