What patients are saying
Overall rating
4.87
Average wait time
4.84
Bedside manner
4.92
“Excellent dentist — thorough, kind, and funny. He really took the time to understand what was going on and find the right solutions. Highly recommend!”
Initials hiddenNovember 5, 2025
“The doctor is very kind and patient, and I had never received care like the one he gave me. He involved me throughout the entire appointment, was very kind, and usually other dentists have hurt me, but this time I felt he did an excellent cleaning in a very careful way.
”
Karla E H.August 8, 2025
About Dr. Gustavo Mongelos
Dr. Mongelos is all about the personal contact between the caregiver and the patient. He understands that personal touch, communication, and education are the key factors in developing a long lasting and trustworthy relationship with his patients. He will warmly welcome you and upon a comprehensive evaluation, will address each and everyone of your concerns with a detailed explanation of the why’s, what’s and how’s of your dental treatment.
Dr. Mongelos graduated on top of his class in 1987 at the National University of Asuncion, Paraguay. He then graduated on top of his class again in 1993 at Howard University College of Dentistry after a two years Pediatric Dentistry Program. He has completed several extensive continuing education programs on Endodontics, Implant and Cosmetic Dentistry, Oral Surgery, and Prosthodontics.
He has been serving the Washington Metropolitan Area since 1995.
On a more personal note, Dr. Mongelos is an avid long distance runner and tennis player having completed several marathons in the last few years. He is a father of three vibrant and beautiful daughters.
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In-network insurances
99% of patients have successfully booked with these insurances
Aetna
BlueCross BlueShield
Cigna
Delta Dental
Guardian
Metlife
UnitedHealthcare
Office location
Education and background
Practice names
Education and training
- Dental School - National University of Asunción, Doctor of Dental Surgery
- Howard University, Residency in Pediatric Dentistry
Race and ethnicity organizations
- Hispanic Dental Association
Awards and publications
- Outsanding Clinical Performance Award-Howard University 1993
- Florid cemento-osseous dysplasia and a dental abscess-Dentistry Today 2011
Languages spoken
- English
- Spanish
- Portuguese
Provider's gender
Male
NPI number
1649377839
Patient reviews
All reviews have been submitted by patients after interacting with the practice.
Overall rating
4.87
Wait time
4.84
Bedside manner
4.92
Your trust is our top concern, so providers can't pay to alter or remove reviews. We also don't publish reviews that contain any private patient health information. Learn more here
300 reviews
Most relevant
Very friendly and my children felt comfortable in his care. I felt comfortable with his care plan.
February 18, 2026Asiyah J.Verified patient
We've been going here 20 years! Great professional, very careful and detail-oriented. Best dentist we ever met.
July 30, 2024Alexander S.Verified patient
I am so thankful I found this office, I highly recommend booking an appointment.
August 22, 2025Sierra G.Verified patient
Friendly, clean, professional, communicative, available! What more could you ask for in a dentist? I’ll definitely go back.
December 17, 2021Initials hidden
Dr. Mongelos was very kind, empathetic and very clear in communication. I felt very comfortable with the care.
March 21, 2022Cristina M.Verified patient
Dr Mongelos was amazing and made me comfortable for my very first dentist visit. I cant wait to go back!
March 16, 2023Kristopher S.Verified patient
Today's visit was very good. I appreciated Dr. Mongelos taking extra time with my son, too. We will be back!
January 8, 2015Initials hidden
Listened to my concerns and I didn’t even felt the pinch of the anesthesia.
More than 1 year agoInitials hidden
Professional, knowledgeable, patient, explains step by step. Excellent service the minute you walk in.
More than 1 year agoInitials hidden
Extremely helpful, explained all the details and made you feel comfortable with what he was doing.
April 22, 2013Morgan M.Verified patient
I had a prior dentist who missed a bunch of stuff Dr. M caught. He’s amazing. Howard Man too!
More than 1 year agoInitials hidden
It was great and professional. He knows what he's doing and his staff member was also excellent.
June 29, 2017Pj A.Verified patient
I always have a good experience at this office. They see me right away, are very kind & quick!
January 25, 2017Rebecca M.Verified patient
Great pediatric dentist - lovely manner with my two children, really put them at ease.
August 10, 2022Lucy J.Verified patient
All of the staff were so kind! Dr. Mongelos was great. I will definitely be going back.
January 17, 2022Betty M.Verified patient
Comfortable and great experience. Profesional and friendly. A major plus bilingual!
November 17, 2022Norma F.Verified patient
Dr. Mongelos was superb! Great skills and outstanding bedside manners.
October 27, 2023Denice C.Verified patient
My visit with Dr. Gustavo Mongelos was so wonderful - I would highly recommend him!
September 6, 2016Rebecca R.Verified patient
Professional, personable, examines and explains everything that he does very well.
March 17, 2016Suhayb A.Verified patient
Great working with the doctor, I have been seeing him for over 20 years
June 21, 2022Cornelius P.Verified patient
No ability to adequately price procedures or give a fair estimate prior.
More than 1 year agoInitials hidden
Great bedside manners! Very gentle and caring with kids. Very Amicable.
January 18, 2018Initials hidden
I think this is going to be my dentist of choice for the years ahead.
August 8, 2016Laura G.Verified patient
He's very informative and shows you your X-rays, which is helpful!
August 18, 2017Meg A.Verified patient
They are great! No wait time, very professional. I'm going back!
January 18, 2017Rebecca M.Verified patient
Always a pleasure to come here! Staff are nice and thorough.
July 12, 2017Rebecca M.Verified patient
Wonderful! First dentist who truly explained things to me.
June 1, 2017Michelle F.Verified patient
This man is a gem. Patient, kind, informative, and funny!
January 7, 2014Sarah O.Verified patient
I would return nice office and respectful employees.
January 6, 2022Annmarie T.Verified patient
GREAT DOCTOR.. I RECOMMEND DR. GUSTAVO..HE IS GREAT
June 29, 2017Talmom S.Verified patient
Excellent dentist — thorough, kind, and funny. He really took the time to understand what was going on and find the right solutions. Highly recommend!
November 5, 2025Initials hidden
The doctor is very kind and patient, and I had never received care like the one he gave me. He involved me throughout the entire appointment, was very kind, and usually other dentists have hurt me, but this time I felt he did an excellent cleaning in a very careful way.
August 8, 2025Karla E H.Verified patient
Dr. Mongelos is an excellent and attentive dentist, the best I’ve ever seen. However, his front-of-office staff can be unreliable.
Immediately following my first appointment, I scheduled a follow-up with the office assistant directly and in person. However, when I arrived for my follow up, I was told I had no appointment and I would not be able to be seen for several weeks. This is extremely frustrating and I hope that I do not experience similar issues with his office in the future.
Less than 1 year agoInitials hidden
Very friendly, took his time to explain everything. His experience and gentle hand were very reassuring. His entire staff is very personable. Highly recommend Dr. Mongelos.
May 23, 2025Suzanne K.Verified patient
Doctor Mongelos is friendly, informative, and professional. He patiently explained my need for a root canal and gave me helpful information for a referral for an endodontist.
February 21, 2025Initials hidden
Excellent
More than 1 year agoCamila C.Verified patient
Highly recommend!
February 19, 2024Courtney F.Verified patient
Always a great visit.
September 13, 2023Rasha R.Verified patient
Today was my son’s first dentist appointment and we were very pleased! Dr. Mongelos along with all the staff we encountered were kind and thoughtful. The office was beautiful and very clean. We were seen with very little wait time. We will be returning!
August 7, 2023Starria G.Verified patient
Dr. Mongelos is the best dentist I have come across in my life in any country. He is very careful in his work. We have even had him fix things previous dentists botched.
June 30, 2023Alexander S.Verified patient
They followed up with me before my appointment, saw me eight right away, and Dr. Mongelos was so kind! Efficient and more explanatory/communicative than any other dentist I’ve seen. Highly recommend!
April 4, 2023Initials hidden
10/10 recommend Dr. Mongelos. He was absolutely fantastic to see as was his entire staff. He is informative, helpful, professional and kind.
March 21, 2023Initials hidden
Best dentist I’ve had!
March 15, 2023Fabion S.Verified patient
Amazing first visit!
March 9, 2023Rasha R.Verified patient
Great dentist! Very professional and caring!
March 2, 2023Initials hidden
Very friendly and educational
February 25, 2023Tayler B.Verified patient
love him, super detailed and friendly
February 3, 2023Jennifer S.Verified patient
Very kind and experienced dentist, I made a first time appointment just based on the positive reviews he has on this site and was very happy with my appointment.
More than 1 year agoMichael M.Verified patient
Dentist was so helpful and not intimidating!
More than 1 year agoInitials hidden
Amazing dentist!!
December 9, 2022Gadiel H.Verified patient
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How soon can I make an appointment with Dr. Gustavo Mongelos?
Generally, Dr. Gustavo Mongelos has appointments available on Zocdoc within 1 week. You can see Dr. Mongelos's earliest availability on Zocdoc and make an appointment online.
Is Dr. Gustavo Mongelos accepting new patients?
Dr. Gustavo Mongelos generally accepts new patients on Zocdoc. You can see Dr. Mongelos's earliest availability on Zocdoc and schedule an appointment online.
Does Dr. Gustavo Mongelos accept my insurance?
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Can I make an appointment with Dr. Gustavo Mongelos online?
Yes, you can make an appointment online with Dr. Mongelos using Zocdoc. It’s simple, secure, and free.
What practice does Dr. Gustavo Mongelos work with?
Dr. Gustavo Mongelos works with America Dental Services.
Where is Dr. Gustavo Mongelos's office located?
Dr. Gustavo Mongelos's office is located at 1800 K St NW, Washington, DC 20006.
What are common reasons for patients to see Dr. Gustavo Mongelos?
Dr. Gustavo Mongelos frequently sees patients for Bridge, Dental Cleaning, Dental Consultation, Pediatric Dentist Consultation, and Root Canal. You can see other visit reasons for Dr. Gustavo Mongelos on their profile.
What languages does Dr. Gustavo Mongelos speak?
Dr. Gustavo Mongelos speaks English, Spanish, and Portuguese.
How do patients rate Dr. Gustavo Mongelos in reviews?
300 patients have reviewed Dr. Gustavo Mongelos. The overall rating for this doctor is 4.87/5. They have a 4.92/5 rating for bedside manner and a 4.84/5 rating for wait time. You can read individual reviews and ratings on their profile.