West Covina Smiles
Oscar Marin, DDS:
Practice Profile Page


West Covina Smiles
Oscar Marin, DDS
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 (open select Saturdays 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!

Krista E. from Brea, CA (Source: Yelp)


Dr. Marin is a very knowledgeable and skilled dentist. I took my 13 year old to him for a tooth ache. He needed a root canal and it was infected. He took care of the problem same day, and my son went home pain free. The best part about it was, he was so gentle my son actually fell asleep during the procedure! Talk about great work!! We will come back for sure!

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.

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.

Veronica O. from Brea, CA (Source: Yelp)


Dr. Marin and his staff are wonderful. They make you feel at ease and take the time to get to know you. They are professionals and highly recommend this office. Trust your teeth with Dr. Marin!

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.