West Covina Smiles
Oscar Marin, DDS:
Practice Profile Page


Oscar Marin, DDS

Smile Design Advanced Dentistry
Brea, CA

West Covina Smiles
West Covina, CA














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

Dental cleaning

White fillings


Inlays & onlays


Sleep apnea therapy

Clear aligners

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: 9:00 am to 6:00 pm

Tuesday: 9:00 am to 6:00 pm

Wednesday: 9:00 am to 6:00 pm

Thursday: 9:00 am to 6:00 pm

Friday: 9:00 am to 6:00 pm

Saturday: 9:00 am to 2:00 pm (by appointment only)

Sunday: Closed





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

Rita Gonzalez (Source: Google)


I had a great experience! Dr. Marin was very thorough and he took the time to explain and answer all my questions. Everyone in this office is so nice. I had been going to the same dentist for over 30 years, when he decided to retire I was devastated, I couldn’t see myself developing trust in another dentist. I tried two other offices but my experience wasn’t the best. Rude staff, rushed attention. With Dr. Marin I felt at ease from the beginning. Even my husband was surprised since he knows I have trust issues from bad past experiences. I highly recommend Dr. Marin and his team to everyone.

Kathy Heinl (Source: Google)


Well, I like many people, do not like going to the dentist at all! That is putting it mildly. This was my first visit to the dentist where I wasn’t a nervous wreck! He puts you at ease right away and I actually didn’t mind it at all. The entire staff is so kind and make you feel welcome. Very professional as well. I had a good amount of work done and I am very happy with the results! Thank you Smile Design!

PJ. A. from La Puente, CA (Source: Yelp)


First of all let me say thank you to all the wonderful staff and Dr. Oscar Marin for always being friendly, kind, attentive, and always receiving you with a smile making you feel like their number 1 patient. The first day of my first appointment i was nervous, but who isn’t nervous to see the dentist right? From the moment i stepped in i was greeted and welcomed by everyone in the front office with a big smile. I was given a tour of the location and was introduced to the rest of the staff dental assistants,  dental hygienist,  and Dr. Oscar Marin, i started feeling at ease getting to know everyone and seeing their awesomely clean and organized location. Once it was time for my turn in the dentists chair i was well taken care of by the dental assistants as i was prepped for the x-rays and all, they kept my mind busy with funny and friendly delightful conversation. Once Dr. Marin came by and greeted me to evaluate my teeth he was very attentive. Let me tell you Dr. Oscar Marin is one of the best dentists if only the best i have ever been to,  he is a 3rd generation dentist. He has a very delicate way of working on your teeth and mouth, and for a dentists trust me that is a very good thing. In all my experience at west covina smiles has been super great, now when i go for a check up i walk in with confidence knowing i will be treated very well by all the stuff and Dr. Oscar Marin, i highly recommend this place it is awesome!!

Alyssa E. from Chino, CA (Source: Yelp)


The entire staff/ crew at Smile Design Advanced Dentistry have been nothing but welcoming, kind, and informative! I will (and have) recommended them to my family and friends because they are just that good! From front of the house to the back everyone is just so happy and kind!

Richmond R. from Rowland Heights, CA (Source: Yelp)


I wish I could give smile design 1000 stars. This place blows me away. I haven’t been to the dentist in over 10 years because I was traumatized as a kid. Dr. Marin puts my mind at ease knowing that he is my dentist. I had a gum cleaning at my previous dentist and all I felt was pain. Dr. Marin did my gum treatment in two sessions and on top of that numbed me so I wouldn’t feel a thing. He is honestly the Superman of dentistry. For all you parents with kids who are afraid of the dentist you should definitely take them here. Thank you Dr. Marin for everything you do. This is my forever dentist!!!!!

Bryan L. from Spring, TX (Source: Yelp)


We moved to Brea from Houston about a year ago. This is  our first visit to Dr Marin’s office and we are very impressed.  His staff is very friendly and helpful. They went above and beyond to make us feel comfortable and helped us with the new patient process.  Dr Marin was very good at making you feel at ease and not being overbearing about somewhat overdue dental check ups and made us feel like a long time patient.

Thanks for a great visit

Candy M. from Brea, CA (Source: Yelp)


I have been coming here for years and when I heard my dentist was retiring I was very disappointed. So far the new dentist, Dr. Marin and staff seem to be pretty good. My son came here and liked it, I am pleased so far and we will continue to come here.

Janet L. from Brea, CA (Source: Yelp)


I was a former patient of (previous owner). When I received his letter in the mail that he was retiring and he highly recommended the new dentist, Dr. Marin, I was a bit worried about the change. But I had major pain in my upper molar and decided to give Dr. Marin a chance. And I am so glad I did. He is so knowledgeable and takes time to explain what may be causing pain and sensitivity in my teeth. He is friendly and never seems rushed. He ensures I am completely numb to prevent any unnecessary pain. He gives professional and personal advice on how to take care of my teeth outside of the office. His staff is amazing… from Maggie in the front office to Myra as Dr. Marin’s assistant, I continue to feel welcome and cared for every time I step into the lobby and dental chair. I highly recommend making an appointment to see Dr. Marin.

Delilah C. from Anaheim, CA (Source: Yelp)


All three dentist who worked on me were very nice and it was my first visit here. For the first time being here I had a good experience, and me and my family will be coming here again. I do recommend this dental service because not all employees are as friendly as these and my I was glad how my smile came out .

Molly F. from Corona, CA (Source: Yelp)


I HATE going to the dentist. I have had horrible experiences as a child and as an adult. I suffer from panic attacks and a balance disorder so always dread when I have to go. My sister had recommended Dr. Marin to me so I thought I’d give him a shot. I was so impressed. Dr. Marin is extremely professional and gentle and patient. He spends a lot of time with you and answers all of your questions and concerns. Mayra and the rest of the girls are so patient and caring. So glad I found a new dentist that I can trust!

Diana G. from Tustin, CA (Source: Yelp)


I have been seen Dr. Marin for a long time, about 10+ years to be more specific and my entire family are his patients now as well, including my toddler son. I am very happy his new office in Orange County is closer to my home.  
Dr. Marin and his staff are great, Dr. Marin is very professional and do a great job. They always work with my insurance and visiting this office is very pleasant. I am grateful with all work he has done to keep my mouth healthier.

Alyssa F. from Brea, CA (Source: Yelp)


Always such a great experience here. Everyone from the receptionist to the hygienist and the doctor have such a sweet demeanor. I’ve never felt like they were pushy on any treatments or anything that you don’t genuinely need done, which I’ve experienced in other dental practices. With getting married AND a baby on the way I’m glad our new family of 3 has a dentist we can trust! 🙂

Ali E. from Irvine, CA (Source: Yelp)


I found this place because it was code to my work, but so far I’ve been very happy with my decision. Everybody is friendly and great. As people have mentioned, cleaning my teeth had minimal bleeding and didn’t hurt at all. One of the few dentist that didn’t try to sell me cosmetic dentistry.

Ralph J. from Rowland Heights, CA (Source: Yelp)


Dr Marin and his staff are amazing. Berlin always takes care of me when I come in for for Invisalign refills. Berlin along with all the other staff are very professional and pleasant. Dr. Marin has the best bedside manner I have ever experienced with a dentist. Dr Marin and staff are considerate of your comfort. I like that I am not pressured into upgrades and unnecessary treatments. I would definitely recommend West Covina Smiles if you are looking for these qualities in a dental office. Thank you West Covina Smiles.

Desiree G. from Sacramento, CA (Source: Yelp)


Dr. Marin and the staff here are absolutely fantastic! I always feel welcomed and am greeted with smiles. They know how to take care of you and your teeth! The staff are awesome and great to talk to. They all make you feel so comfortable. I usually hate going to the dentist, but this is the first dentist I don’t dread going to. If you are looking for a dentist, I would definitely recommend Dr. Marin! Thank you to Dr. Marin and the staff for always treating me good and taking care of me and my family!

Jessica D. from Whittier, CA (Source: Yelp)


Who can say they love their dentist??? I CAN!! I absolutely love coming here. I enjoy my dentist. Dr. Marin is such a great doctor, he’s kind, VERY GENTLE, informative, and will explain everything to you throughly. The staff here is incredible, they are professional, sweet, funny, and make you feel so welcomed. Jackie, Mayra, Daisy, and all the other women treat you better than just a client, they treat you like a friend. They create great relationships with their clients and they have great customer service. This is the type environment that you need if you have a fear or anxiety about the dentist, because they will make you change your perspective and turn your fear into comfort. Your mouth is a dirty dirty place and proper oral hygiene leads to a healthy body. Needless to say, this will be my dentist forever. They have easy payment options, patient deals/specials, a loving staff and of course, free toothbrushes! Lol

Mauro A. T. from West Covina, CA (Source: Yelp)


After years of neglect and multiple failing teeth I finally decided to check out Dr. Marin. I really wish I had done this sooner because I yet to meet anyone who is as friendly and knowledgeable as he … Im grateful that rather than making me worry and feel bad about my bad teeth, we put together a comprehensive plan to bring my oral health up to speed. On top of that I look forward to my visits because the wonderful staff is always so welcoming. Its been about a month as a new patient and my tooth ache is gone and my gums are looking much better. Thank you West Covina Smiles! You Rock!

Chris I. from La Puente, CA (Source: Yelp)


I was looking for a perfect place for dentistry and orthodontics and I found it!  I instantly went on Yelp looking for a place and West Covina Smiles was the top selection so I decided to take a chance based on the reviews and I’m glad I did.  The whole staff is so friendly!  Usually going to the dentist scares me but Dr. Marin made me feel so comfortable.  As for financial help, Gisella really helped me with all the payments and helped me fully understand everything!  I’m very happy to be going here for my dentistry and orthodontics!

Brenda Amador (Source: Facebook)


I’ve been Dr Marin’s patient for the last 12 years, he is a dedicated dentist who goes above & beyond to help me keep a healthy & beautiful smile, he only hires the best! Everyone at his office is very welcoming, patient & friendly not only that but I’m usually in and out with no time wasted waiting and when you are always busy with two jobs….that’s a big plus!!!

Michelle T. from Carson, CA (Source: Yelp)


Dr. Marin is extremely gentle, I never feel a thing. The office staff is very friendly, Dr Marin is always on time and does most procedures himself compared to other offices I have been to where other dentists have their staff do everything and they just pop in and out. All the staff seem to enjoy working together. I usually dread going to see a dentist, not at smile design, I actually look forward to getting my dental work done. I highly recommend Dr Marin and his staff.

Kayla E. from Fullerton, CA (Source: Yelp)


I walked into Smile Design after an embarrassing amount of time not going to the dentist. Of course i was a little nervous after it being so long, but the whole team was so kind and welcoming that it totally put me at ease. Each person who walked in genuinely asked how I was doing and got to know more about me, my family, and my business. And they all actually cared! They all have families themselves and really value family. The dentist came in and asked how I was doing and what concerns i had with my mouth. He listened and made me feel heard before even taking a look. When it came time to have some work done (cleaning and fillings), they were super gracious, quick, and GENTLE. They even numbed me before they gave me a shot. I didn’t feel a thing. There isn’t one rude person in the whole office. They’re so sweet and fun and it feels like a family. So so thankful I found this place

Luciano Y. from Fontana, CA (Source: Yelp)


Dr. Marín is a highly skilled Dentist, he is truly detailed and gentle when doing the procedures, their equipment its state of the art, instant HD X-rays and HD pictures of my teeth,  he is thorough and has a high attention to detail. My wife and I are very lucky to have found this clinic, the staff is wonderful and super friendly, the do care about every one of their patients.

Carlos R. from West Covina, CA (Source: Yelp)


Thank you Dr. Marin and West Covina Smiles for taking me in on such short notice! After dealing with a massive toothache for 3 days I couldn’t bare the pain anymore. Went in to see Dr. Marin and it turned out, I had a really bad infection that required the tooth to be pulled immediately. Most dentists wouldn’t do the procedure when the tooth is infected and in pain but Dr. Marin realized the pain I was in and decided to perform the procedure. OMG! I walked out of there feeling relived and feeling myself again. Thank you, Thank you, Thank you!

Monica Z. from Brea, CA (Source: Yelp)


Just came for the first time and the customer service by perla was amazing.  All my questions were answered and all procedures and insurance coverage was explained thoroughly.  I really appreciated the honesty of Dr. Marin and how he only does the procedures that are necessary and takes his time to explain everything clearly.  I am so happy I have a dentist I can continue to come to and trust.  Definitely will recommend anyone to come here.

Jeffrey M. from West Covina, CA (Source: Yelp)


I will first say that Dr.Marin and his staff are amazing. I was quite hesitant to try the new dentist that took over for my previous dentist that I had for 10 years. But Dr.Marin and his staff were very friendly and put all my worries to rest. His staff are very knowledgeable and friendly. They made me feel as if I had known them for years. Dr. Marin is very pleasant and has a gentle touch. He was great with my 2 year old even though he was being quite the difficult patient. Both my wife and I had our first visit with him and enjoyed the added technology he brought in that the previous dentist didn’t have. Upon completion of our exams he didn’t try to up sell us on procedures that were unnecessary and only told us what needed to be done. Both of our cleanings were done professionally and I must say the fluoride was quite enjoyable. Wife and I scheduled our upcoming treatments and they also offer 5% off if you pay upfront which I thought was nice addition. Few weeks later we returned for our treatment and wow! Dr. Marin knows his profession. Treatment was fast and painless. Gentle touch and always mare sure you were comfortable. His dental assistants are very friendly and make sure your comfortable the entire time(…).

Javier Vazquez (Source: Google)


Dr. Marin is a true professional. He is very knowledgeable in his profession. He is expensive, but you really get what you pay. They do have payment plans

I’m not a fan of the dentist, but I am now a fan of his.

Lili P. from Monrovia, CA (Source: Yelp)


I have been seeing Dr Marin since they took over Dr Sahyan practice. The office is very well organized and all staff members are very friendly.  Dr Marin is very professional and always makes me feel comfortable on my visits. I have referred family members and friends to his office as well.

Candido L. from West Covina, CA (Source: Yelp)


I got a really warm feeling coming in! That’s the first time I’ve ever felt that i was a friend rather than a patient. I like how everything was detailed and everything was up front. I’m also happy that they checked on me to let me know how I was liking the visit. That made me feel very comfortable and not just another patient. I honestly am glad I came across this place! They really made me feel apart of their family even though I’ve only had one visit so far. I normally don’t spend my time doing these reviews but i have to give credit to where it’s due. I will be making this place as my primary dentistry!

Andrew Cheng (Source: Google)


I knew I was having some issues because I have been postponing my dentist appointment for a few years. This office came highly recommended by one of my friends I really like Dr. Marin’s no b.s. approach. He went over the issues that were more critical and structured a plan to get my back teeth in shape. I’ve always wanted to have straight teeth but I feel like I’m too old to have braces, so he suggested doing Invisalign as a second phase of treatment. So far I had a deep cleaning and my gums feel and look a lot better, I thought I was gonna be in a lot of pain, but it didn’t bother me one bit. I recommend this office for anyone looking for a clean office with above average, friendly service.

Charliza V. from West Covina, CA (Source: Yelp)


Where do I begin? Amazing staff, clean work space, caring & friendly dentist. First came here for a consultation back in 2017 (I was given a tour of the building and all it’s amenities) then following with a deep cleaning & a tooth extraction. This review is long overdue, I’m extremely glad to have found West Covina Smiles because I don’t think I’ll ever go to another dentist again. Thank you Dr.Marin & the wonderful staff.

Morgan M. from Chino, CA (Source: Yelp)


Dr. Marin and his staff at West Covina smiles never lets us down. It’s getting close to the end of the year and we were constantly reminded that our dental benefits would expire if we didn’t use them soon. Thanks to the office staff constantly reminding us, I finally scheduled myself and my two children dental appointments at the last minute and quickly got appointments .I’ve have been  going to Dr. Marin For more than five years now. Even when we moved out of the area we continued to come to West Covina Smiles, mainly because of his professionalism and friendly staff. I even recommended my twin brother and his family and they now also go to West Covina Smiles. So with all that being said if you are looking for a honest, professional friendly dentist LOL and yes some dentists are friendly, I would recommend going over to see Dr. Oscar Marin at West Covina smiles…… Klevontey

Sam B. from La Puente, CA (Source: Yelp)


Where do I even start ? I’m so thankful I came across this dental office! Before I came here I felt like I was getting fillings non stop and there was no solution to my dental issues. When I started seeing Dr. Marin he discussed my dental issues and came up with a treatment plan. I was always concerned about having amalgam fillings and most dental offices always advised against removing them but when I spoke with Dr. Marin he recommended that we should remove the almalgum fillings and replace them with the white fillings. Since I have been coming here I have not had reccuring cavities and the sensitivity I had with cold foods has improved. Overall my dental health has improved and I am so thankful! Also the staff is amazing ! They are always friendly and make you feel so welcomed. It’s rare to come across an office where the staff seems like they actually enjoy where they work ! If you care about your dental health you should definitely book an appointment with Dr. Marin !

David G. from Rancho Peñasquitos, San Diego, CA (Source: Yelp)


My wife and I started our treatment with Dr. Marin and his staff at West Covina Smiles about 6 months now and I can say from the very beginning of our first visit it’s been a pleasure being a patient here. The environment is very friendly , very clean, very professional, and I really do like the way that Dr. Marin and his staff treat his patients more so like friends rather than just clients/business. Always greeted very friendly and welcoming from the moment we walk in. I have a very busy schedule so there are times where we do set an initial appointment after my visit and things change frequently do to my job and they always work with me to accommodate. I really do feel they have you in their best interest. Perfect place to begin treatment, I was recommended and I do see why. I would recommend it to anyone looking for braces or Invisalign. More than satisfied with every visit.
Thank you guys so much my wife and I really appreciate it!

Carole W. from San Francisco, CA (Source: Yelp)


Dr Marin and his staff took excellent care of my mother who is almost 90 years old. Gabby and Berlin were above and beyond! My mother got dentures. Dr Marin was kind and patient with her. He took extra care making sure her dentures were fitting properly. The office is very clean. My mother felt cold and they provided her with a blanket. Great dentist…great staff…great place.

Laloni B. from West Covina, CA (Source: Yelp)


I have made West Covina Smiles my home for all my dental needs. I came here in August to get a second opinion and was welcomed with open arms. Dr. Marin answered all my questions and let me know all option. After so much at ease I booked my wisdom teeth surgical procedure. The day of the procedure was nerve wrecking (I have bad anxiety problems) but with Dr. Marin and the whole staff at my side I felt so comfortable and  was able to remain calm during the procedure. Dr. Marin called me a few days later to check in on how I was feeling and from that moment I knew I was more than just a number. I was a patient who he actually care about. A few days after that I got a phone call from Melissa who also is a staff member to inquire about my well being. All consecutive appointments had the same warm feeling. I am now having ortho visits with Dr. Marin. I made the right choice coming here.


Dr. Oscar Marin is a 1997 graduate of Javeriana University Dental School, one of the most prestigious schools in Latin America. He is also a member of the Academy of General Dentistry. Dr. Marin has received extensive training in restorative and implant dentistry. His commitment to comprehensive general dentistry and his gentle touch allow him to treat patients who are fearful of dentistry with exceptional results. Experience gentle, expert, and affordable dental care with Dr. Oscar Marin and West Covina Smiles. Our emphasis is on getting to know each of our patients while providing quality, gentle dentistry and great results. We use the most advance technology to treat our patients. You can relax in the comfortable and friendly environment that our office provides. Our specialties include General Dentistry, Cosmetic Dentistry, Oral Surgery, Orthodontics, Endodontic, and those with Dental Phobia. At your consultation appointment, Dr. Marin will explain in detail the findings, treatment option, length of expected treatment, anticipated result and payment options. We understand everyone's financial needs. That is why we have several affordable and flexible payment options available.