M Street Dental
Mark Tromblay, DMD:
Practice Profile Page


M Street Dental
Mark A. Tromblay, DMD
Washington, DC













A list of major dental treatments which I offer my patients:

Dental cleaning

White fillings


Inlays & onlays


Clear aligners

Sleep apnea therapy

Porcelain veneers

Teeth whitening

Dentures & partials

Root canal treatment

Tooth extraction

TMJ treatment

Dental implants


Offers Even28 at-home™? No

Offers Even28 at-dentist™? No

Offers Invisalign®? Yes


Monday: 7:30 am to 4:00 pm

Tuesday: 7:30 am to 4:00 pm

Wednesday: 7:30 am to 4:00 pm

Thursday: 7:30 am to 4:00 pm

Friday: 7:30 am to 12:30 pm (by appointment only)

Saturday: Closed

Sunday: Closed





Check out what some of our happy patients are saying about us:

Janet Abrams (Source: Google)


I’ve been a patient of the practice for more than 20 years and highly recommend Dr. Mark Tromblay and his wonderful staff. When friends grumble about going to the dentist, I realize how fortunate I am to have a world-class care team who take genuine interest in my dental health, addressing (as painlessly as possible!) any problems that arise and delivering thorough preventive services. The office environment is pleasant and comfortable — Everyone there greets me warmly, and I even get to watch Netflix animal videos on a screen overhead! Dr. Tromblay always has his eye on the future, advising me on how to optimize my chances of maintaining healthy teeth and gums ’til I’m at least 100.

Cyndy M. from Reston, VA (Source: Yelp)


When was the last time you loved your dentist? I cannot say enough positive things about this dental practice and every single person that works here. Dr Tromblay worked with me to get me the gorgeous smile I wanted, and the gentleman (on site) who makes your crowns and veneers is a true artist. So recommended.

Rosario Santos (Source: Google)


Exceptional Dentist, Amazing Staff & TOPNOTCH COVID PRECAUTIONS!! I saw Dr. Tromblay today to get a tooth fixed, and per usual, his work was flawless. It was reassuring to see the precautions in place to keep his patients and team safe. Each room is completely encapsulated and equipped with air purifiers, making it feel like you’re the only one in the office. These efforts are much appreciated during a time when anxiety is through the roof! I’ve been a patient now for 15 years, and I could not be happier. The expertise, professionalism, and dedication of the entire team is off the charts. If you’re in need of dental care, check them out. You won’t be disappointed!

Mark W. from Arlington, VA (Source: Yelp)


I wouldn’t want anybody else drilling holes in my teeth and filling them with love. Seriously though, I was referred to Dr. Tromblay by my previous dentist and I’ve been quite happy. The treatment rooms have these gorgeous views of Georgetown, and on a pretty day your mind can happily drift away. Also, Dr. Tromblay is a pretty cool dude, really has that “bedside manner” down to a science. Front office staff and hygienists are also super friendly.

M. J. from Washington, DC (Source: Yelp)


I’ve been going to Dr. Tromblay for over 10 years.  He has methodically addressed each issue I had from going to other dentists whose work was quite shoddy (verified with a second opinion from a periodontist).  He is patient, thoroughly explains his approach and is quite the perfectionist.  The office staff is efficient and very friendly.  I’m so glad I found M Street Dental – and am fearful of having to move out of the area necessitating a new search for another dentist…

Dava Berkman (Source: Google)


Georgetown M Street Dental is an excellent dental practice. My dentist, Dr Tromblay, takes a real interest in me and my dental issues. He ensures that crowns fit perfectly and perseveres until you’re 100% pleased with the results. The office is immaculate and the dental assistants are extremely capable.

Peter Kazon (Source: Google)


We have seen Dr. Tromblay for almost 10 years and could not be more pleased with the care we have received. In addition Dr. Slade has been an excellent addition to the practice. They are thorough and careful without recommending unnecessary and expensive services. I have had several issues that required immediate attention and they are always able to accommodate my needs. Finally the staff is always friendly and easy to deal with. It almost makes going to the dentist something to look forward to

Catherine Orr (Source: Google)


If you are looking for a stellar patient-centered dental practice, M Street Dental is the one! I have been a very satisfied patient of Dr. Tromblay for about 8 years now. His office has always provided excellent care to me for my regular cleanings (Mary Kay is a meticulous hygienist). The Front Desk staff are extremely pleasant to work with, not to mention efficient and helpful for billing and scheduling issues. I recently decided to take the plunge and have 8 upper crowns to replace the veneers delivered by another dentist. The veneers were stubby, ill-fitting and caused my gums to be in bad shape (due to irritation). I have a couple of congenitally missing teeth, so the process to figure out how to compensate for the missing teeth and give me the best smile was complex. Dr. Tromblay coordinated with a nearby periodontist who first performed crown lengthening surgery to expose more of the gums/tooth structure. Based on my prior experience with Dr. Tromblay, I knew he was a perfectionist and the experience would be great. Dr. Tromblay took the time to explain all the steps of the treatment plan; and Dr. Tromblay and his assistant Gloria made sure I felt as pain-free as possible while I was in the chair. I truly cannot thank Dr. Tromblay, the ceramicist who fabricated the crowns (Kurt), and the lab technician who made the temporary crowns (Chuck) enough for my new smile. My smile is amazing; everyone says they have not seen me smile so much before!

Sharon Bryson (Source: Google)


Dr. Tromblay saved me! I had some horrible dental experiences prior to being referred to him. I was so anxious I could hardly sit in the chair and my dental health was in serious jeopardy. We put together a plan and worked together to completely correct my many dental problems. I am over-the-moon happy and proud that I was able to get past the anxiety. Dr. Tromblay’s approach allowed me to trust that he would not hurt me. I don’t know how else to say it – he is simply the best!

John McNally (Source: Google)


Before I describe my treatment journey with Dr. Tromblay, Dr. Slate, and staff, I would like to describe the COVID safety protocols that have been put in place for patient and staff safety. You may be concerned about receiving dental treatment during the COVID 19 pandemic but should not delay your treatment. First and foremost, the practice has a unit in each treatment bay that recirculates the air and has UV light that kills virus. Second, there is a plastic shield around each treatment bay so that each bay is contained. The practice has also implemented safety and screening procedures for patients and staff, including temperature checks, increased hand washing, and a special rinse that all patients complete before treatment begins. Finally, the drilling speed while receiving treatment has been reduced to reduce the amount of splashing and for regular six month cleanings, polish is applied with a toothbrush instead of using the electronic tool. It is important to note that not maintaining your dental health can have negative effects on your overall health so please do not delay treatment. I feel completely comfortable receiving care in this practice, both before and after COVID, and the results have been remarkable. My journey with Dr. Tromblay started in May 2019. I was referred by my periodontist, Dr. Zalewsky, for replacement of a cracked veneer that had been placed in 2007. In addition to the cracked veneer, I also had spaces in between my top front teeth and the shape of the lateral teeth was not uniform. I also lacked cuspid guidance with my left cuspid. Dr. Tromblay put together a comprehensive plan to address all of these concerns with 5 crowns across the top front, including teeth whitening to get me the brightest smile possible. The plan included crown lengthening at Dr. Zalewsky’s office to get the gums in the correct position. I’ve since had 3 crowns with Dr. Tromblay and a 4th is planned for next year. I’ve had so many compliments regarding my top front teeth and these look great so having treatment at Dr. Tromblay’s office was really a game changer for me. The final results were better than expected and I never could have imagined this outcome. I’d like to offer some comments about the culture and professionalism that exists within this office. First and foremost, it is clear to me that this team enjoys working with one another and respects each other. This brings a certain level of comfort to me as a patient and this is not a widespread characteristic among all work teams. The team strives for perfection and places a lot of attention on details in their work. In terms of comfort, Dr. Tromblay is very gentle when he places anesthesia in your gums before treatment and is so gentle you can barely feel it. When I had my teeth whitening, the assistant Gloria and Dr. Slate gave me the option of the high performance gel or sensitive gel. That same day, Dr. Slate took several measurements of my teeth and face so that my crowns would be the perfect shape and size. He was covering for Dr. Tromblay who had a death in the family and he exceeded my expectations. This was before COVID and I only expected a handshake and simple hello. He went out of his way with his time and effort on my case and I really appreciate it. Finally, after my first crown treatment, Dr. Tromblay called me that evening to see how I was doing. My dental work would not have been possible without the support of several highly capable staff members. Cindi, Nia, and Judy have helped chairside with procedures and impressions. Chuck has been involved in my treatment as well, doing all of the behind the scenes work in the lab. Dani is M Street Dental’s hygienist. In addition to her high capabilities, she is a delight to speak with. Finally, Jamillah is M Street Dental’s concierge. You can always count on Jamillah for a bright smile, warm greeting, and all of the coordination needed to schedule appointments related to your treatment plan. I highly recommend this practice for all of your dental care needs.

Randy King (Source: Google)


Highest Recommendation! There may be other fine dental practices in the metro area that are as superb as this one, but none are better. I have been a patient here for 30 years and have the very highest confidence that I am receiving the best possible dental care. Over the years I have referred others who invariably share my admiration and high regard for the entire staff.

Edward Silverman (Source: Google)


Dr. Mark Tromblay is a truly outstanding dentist and a great guy. He and his entire team exhibit the highest level of professionalism and warmth. Following a recent accident involving a chipped and cracked teeth, he clearly explained all treatment options with a recommendation which produced a result that enhanced my overall dental appearance and health, but my overall self esteem as well. I would not hesitate to recommend this practice. Dr. Tromblay and EVERYONE in this practice make you fell like a person and not simply a patient to be seen and moved on.

Colin Shah (Source: Google)


If there were an option for more stars I would have! I’ve been a patient for over 20 years when he first did my veneers they are as good now as they were the day they went on! His offices are spotless, bright and cheerful. The staff is always smiling and goes out of their way to ask about my family, a true class act! If you have been looking for a dentist, look no further!

Cyndy McCollough (Source: Google)


Having Dr Tromblay as my dentist has been a complete game changer. His office provides complete mouth care, not just a filling here, a crown there. He created a holistic plan to get me from where I was (my mouth was a mess) to where I am today – and this included oral surgery, wisdom teeth extractions, crown replacements. The whole magilla. His office also has an in-house lab and technician, so you won’t wait months to get your crowns. The people that surround him are phenomenal, the very best at what they do. Honestly, you might pay a little bit more, but it is completely worth it.

Sam Lieberman (Source: Google)


Many years ago when I moved to DC, I was referred to Drs. Gadaire and Tromblay at M Street Dental. Dr. Tromblay has been been my dentist for nearly fifteen years and I could not be happier with the quality of care, professionalism, and dedication I experience from Dr. Tromblay and the entire M Street Dental team. Dr. Tromblay is an exceptional dentist. Whenever I go for my checkup, I am confident that I am getting a thorough examination following a thorough cleaning. On the few occasions when I have had dental procedures done, Dr. Tromblay has handled them with care and precision. I value his advice about my oral care and I appreciate his connections to the dental community in the DMV. He was able to provide an excellent referral to a pediatric dentist for my boys, which meant a lot to me. I cannot speak highly enough of Dr. Tromblay, Rebecca – my dental hygienist, and the entire team at M Street Dental. They are the best.

Tim Sparrer (Source: Google)


Incredible dentist. I was in the area on vacation and had broke a tooth on the plane the night before. Being 3,000 miles away from home and a broken front tooth. He was outstanding, very clear in describing what he was doing, One of the best Dentist I have ever been too. I would fly out to see him as my regular dentist if possible. I highly recommend him as he was very knowledgeable as he made recommendations that I should ask my dentist about. I am very grateful to Dr. Trombley and would highly recommend using him.

Pamela Getchis (Source: Google)


Dr. Tromblay is a top notch Dentist in Washington, DC. With enthusiasm and compassion, he has helped me and my family through complicated dental issues over the past 15 years that required a high level of expertise. Dr. Tromblay and Team have truly given us something great to smile about and we are grateful! Thank You from The Getchis Family.

Peter K. from Washington, DC (Source: Yelp)


Dr Tromblay and Dr. Slade are excellent dentists. We have been seeing Dr. Tromblay for almost 20 years. He and his staff are wonderful to deal with. He is thorough and careful and always fully explains what needs to be done and why. At the same time he has never suggested unnecessary  (and expensive) procedures. His staff is also always a pleasure to deal with. Couldn’t be more pleased

Seth J. from Falls Church, VA (Source: Yelp)


I’ve been a client of Dr. Tromblay for almost 5 years now and got nothing but good things to say about his skills as well as bedside manners. I haven’t visited a dentist in 10 years before coming to see him, so you can imagine that my mouth was a mess. Dr. Tromblay took time to explain different treatment options and gave me a choice based on how much I was willing to spend. If he’s taking short cuts, then you would know why (usually $$ reasons on your side) and the exact difference in relation to a full job. What’s also important, he refers you to specialists who are equally, if not more, skilled than he is in their fields. Maxillofacial surgeon – top notch, endodontist – awesome! You never know how good or bad your previous dentist was until you see Dr. Tromblay. M Street Dental does not accept dental insurance, but they will provide you with the paperwork to submit your claims. Charges are on the upper end of the insurance payout scale (sometimes they go over) which is expected when treated by a dentist of such reputation and skill

Leslie Rathjens (Source: Google)


I switched to Dr. Tromblay several years ago after he gave me a second opinion on an issue that seemed to stump my prior dentist. I have been delighted with Dr. Tromblay’s work since then and could not recommend him more highly. He’s a good listener, he’s clearly caring, and his work is meticulous.

Scott Maberry (Source: Google)


Dr. Slate and Dr. Tromblay are an amazing team. Expect a professional and courteous greeting from the excellent staff, a comprehensive examination, a thoughtful and detailed evidence-based treatment plan, and meticulous attention to detail. Put all that together with the friendly but never smarmy “chairside” manner of the whole team, and you get what in my personal experience is the best dental treatment I’ve ever had. Highly recommended.

Olivia Sheldon (Source: Google)


#1, Best of the Best Dentist in our area and beyond, and I’ve been to quite a few, unfortunately. I completely trust Dr. Tromblay’s incredible skill, expertise, and craftsmanship. Seriously, he’s like an artist with his work, from sculpting my numerous crows and fillings, fixing my bite, adjusting a night guard, etc. He has literally saved me, as I came to him in 2014, in crisis dental mode, with tons of pain and issues. He plotted out a plan and made me feel confident and calm–not an easy task! He’s patient and precise, extremely intelligent and thorough, explains every option, describes what he’s doing before and as he’s doing it, and is so gentle with numbing (that’s a treat!). He’s the consummate professional, with a sympathetic touch! During these Covid times, he has extra safety measures in place (patients don’t cross one another, rooms separated by plastic (looks hospital grade,) air purifier in EACH room–very comforting during scary times when you still need to go to the dentist. His staff is friendly and caring too. When you’re desperate and in pain, which I have been too many times to count over the years, you want reliable, dependable, kind, and an expert in the field Dr. Tromblay exceeds expectations! I 1,000% recommend the special, gifted, one and only Dr. Tromblay!

Colleen Cavanagh (Source: Google)


Thanks Georgetown M Street Dental! Their experience and expertise saved me from having to suffer through braces as an adult. After I few short months wearing a new night guard, my teeth realigned themselves, and I was able to chew more easily. Many $$$ saved and many hours at the orthodontist prevented. Thanks so much!

Craig Cote (Source: Google)


I have known Dr Mark Tromblay both personally and professionally for over 20 years. After graduating from Middlebury College, he attained his DMD from the University of Connecticut School of Dental Medicine. Graduating top of his class, he was chosen as commencement speaker. A consummate professional, he is kind, considerate, gentle and his work is flawless! Moreover, his office staff, assistants and on-site dental labratory technician are remarkable. With the addition of Dr Jonathan Slate, this practice is a class act.

Amy D. (Source: Google)


This dental practice is FANTASTIC. I’ve been seeing Dr. Tromblay for 12 years now, and I’ll never go anywhere else. He’s the best dentist I’ve ever been to, and I’ve referred a number of friends to him over the years who love him too. I trust his practice with everything from routine cleanings to more complicated dental work that I’ve needed over the years. The entire staff is extremely professional and helpful, from the front desk to the dental hygienists. I recently needed some emergency dental work to repair a crown that broke on a Friday, and Dr. Slate was able to fit me right in and get started on a new crown that same day. Dr. Slate was excellent, and I wouldn’t hesitate to see him again in the future. The practice is located right on M Street in Georgetown. It’s walking distance from Foggy Bottom metro, but it’s easy to find street parking during the day. Can’t recommend them highly enough!

Carly B. (Source: Google)


I was referred to Dr. Tromblay by a dentist in my home state when I moved to DC, so he could take over my dental implant case. My case is very complex and I had already had implants for two front teeth at a previous dentist, and had them removed and replaced due to complications. Dr. Tromblay took over the process of designing and delivering my crowns, and they are amazing. Because they are for front teeth, they are prominent in my smile, and they absolutely look natural and blend in perfectly with the rest of my teeth. After going for years missing two front teeth, the impeccable crowns that Dr. Tromblay created have changed my life. I am very grateful for the time and dedication he showed in helping me arrive at a perfect smile, despite the challenges posed by my implant positioning and other complexities. I would highly recommend this practice to anyone looking for a dentist in the area.

Mary Lehner (Source: Google)


I have been a patient of Dr. Tromblay’s for years, and I am constantly impressed by his and his office’s excellence and professionalism (particular shout-outs to Judy and Gloria). During the pandemic, they have taken their care to another level, sealing off patient rooms, using high quality air filtration systems, and enacting the strictest COVID protocols. I am a nervous patient, but not in Dr.Tromblay’s office, even in COVID times. Wish I could give extra stars!

Gail (Source: Google)


Best dental experience I have ever had! I am an anxious dental patient and Dr. Tromblay made me feel completely at ease. He explained everything thoroughly and he is extremely gentle and kind. I had no pain whatsoever, not even from the novocane needle. The crown he made is beautiful and looks like my original tooth. The office has state-of-the art equipment, is clean and comfortable. His staff is also the best. Thank you Dr. Tromblay and staff!

Margarita R. (Source: Google)


First Class Dentist Dr. Tromblay. perfect size practice. My mouth needed a lot of dental work and couldn’t be more please with results. Also Dental Assistant Gloria couldn’t be more experience, knowledgeable and kind. I am a very nervous patient and they took good care of me. Thank you so much .

Rachel Podnos (Source: Google)


Over the last year, I’ve had extensive dental work done by Dr. Tromblay. From my first appointment on, him and every employee at M Street Dental made me feel more comfortable and at ease than I have ever before felt in a dental office. On multiple occasions, Dr. Tromblay blocked time out of his schedule just to walk me through the various procedures I was having and answer any questions that I had. Procedures with him were minimally painful, and sometimes even relaxing. He has a great chair-side manner. Most recently, he crowned five of my front upper teeth. Unlike many cosmetic dentists, he actually has a ceramist in-house who came into multiple appointments to look at my teeth, make adjustments, and get to know me. This level of quality-control is beyond what I have ever seen elsewhere. Most importantly, my teeth look incredible! I couldn’t be happier and I’ve had a ton of compliments. I will be a patient for life!

Peter Herman (Source: Google)


I’ve been a patient at this practice since about 1995, first with Dr. Eugene Gadaire I stayed with the practice when Dr.. Mark Tromblay took over in 2010. Dr Gadaire put bridges in my entire mouth but 2 sections in my lower jaw needed to be replaced in 2015. Dr. Tromblay did a great job and I continue to trust him to maintain my teeth.

Laurie Landy (Source: Google)


My appt. was May 21 for a permanent cap. Duration was roughly an hour. I feel that Dr. Tromley has taken extraordinary care and done everything humanly possible to insure the safety of his patients. I also found him and his staff to be very careful about every detail from the time I entered to the time I left. There are extremely diligent. And they also tried to maintain a cheerful attitude, all things considered. Thus, although I was quite apprehensive about going to the dentist at this moment, I left my appointment feeling decidedly more reassured.

Erik (Source: Google)


I became a patient of Dr. Tromblay’s approx. 10 years ago. At my first visit, he was the ONLY dentist to sit down and actually ask me how I felt about the condition of my teeth. I explained to him that with my previous dentist, there was NEVER any conclusion to the treatments. I would leave every appointment worn out physically, emotionally and with a lot less in my bank account! Mark put me ease, we developed a mutually agreed upon plan and timetable to improve my teeth. At each appointment he explained to me, in layman terms what he was going to do. His chair side manner is tremendous, he actively listens and will answer your question honestly. After EVERY appointment I found myself feeling I was finally in the hands of a true medical professional! He is very detailed oriented and on 2 occasions detected minor problems that were easily fixable. He found these during routine checkups and none of them had exhibited any pain or sensations that would have drawn them to my attention. Jump forward to the present and I go to his office with ZERO trepidation! The office staff is OUTSTANDING and a pleasure to work with. I referred a number of my friends and coworkers to this practice, including my 83-year-old mom! She loves the care that she has been receiving with Dr. Slate!!!! If you are new to the DMV or looking to receive amazing dental care, then this is the place! You cannot go wrong! Erik G.

Suzanne Dunn (Source: Google)


I was very pleased with Dr. Tromblay’s chair-side manner. I didn’t realize how anxious I was until the day he removed my existing crowns. He was calm and reassuring. The work he did was pretty remarkable. I had broken my front teeth at age 7 and had several different style of porcelain, but all had eventually cracked. The decision to do bridgework was the right decision and Dr. Tromblay patiently waited the 3 years it took for me to make the decision with little to no pressure. I am very pleased with the results.

Karen McDonnell (Source: Google)


I can’t stop smiling! You could not ask for a more personable and professional dental practice. I’ve been with the office for over 10 years and would you believe I actually look forward to my appointments?! Dr. Tromblay is a perfectionist and who can’t love that in a dentist. When I was growing up I broke both front teeth, had the full root canal, repeated bondings, bleaching, and over the years there was less and less we could do to keep my smile bright. However, I could always tell those people who didn’t have their own teeth, who had caps, the fake teeth that didn’t look quite right, and there was no way I wanted people to notice a fake tooth on me. So for 30 years I did what I needed to do to not get noticed. But then I needed to have a crown put on a back tooth. Dr. Tromblay walked me through the process and in the end you cannot tell which of my molars is not original. So… I decided to jump in and get my front teeth replaced. His team was fantastic through the process. They are all artisans who take their craft seriously. Different lightings were used to ensure the right shades were chosen and the meticulousness of the team created a smile that was better than Mother Nature intended. The whole office team was as excited as I was when the mirror was handed to me to see the new me. I literally can’t stop smiling!


The practice of Mark A. Tromblay D.M.D. and Johnathan Slate D.M.D. provides leading professional dental services ranging from general/preventive care to complex restorative and cosmetic/reconstructive services. Our practice has been named many times over the past years as among the top dental practices in the Washington, DC metro area by Washingtonian Magazine as well as Checkbook Magazine. Our purpose is to help our patients overcome their dental health challenges and face their world with confidence. We accomplish this by honoring our passion to deliver exceptional dental care and personalized service to our family of patients. Would you like us to lead you in taking the first step of your journey? Mark is M Street’s CEO & Owner. Cosmetic and reconstructive dentistry are his strengths. His hobbies include weight training, running, Peloton, and skiing. In college, Mark’s favourite class was introductory Italian. His favourite breakfast food is eggs benedict (with lobster). Mark claims that his de-stressor is playing basketball with his two daughters, Alice and Olivia. “I had an incredible mentor, Eugene Gadaire, DDS, who taught me to learn from my mistakes and deliver the finest dentistry possible with the best materials and techniques available. Perhaps, more importantly, he taught me the powerful importance of meaningful relationships with your family of patients.“