Hee Yon Koh Dentistry
Hee Yon Koh, DMD:
Practice Profile Page


Hee Yon Koh Dentistry
Hee Yon (Clara) Koh, DMD
Mission Viejo, CA













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

Dental cleaning

White fillings


Inlays & onlays


Pediatric dental care

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: 11:00 am to 6:00 pm

Tuesday: 8:00 am to 4:00 pm

Wednesday: 12:00 pm to 7:00 pm

Thursday: 8:00 am to 3:00 pm

Friday: Closed

Saturday: Closed

Sunday: Closed





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

Daniel Kim (Source: Google)


I got a referral from my friend to visit Hee Yon Koh Dentistry. I’m so happy that my friend referred to this doctor!! Finding a good doctor or dentist usually takes a lot of trial and error for most people. Everyone here was super friendly and reassuring from the moment I walked in, to the moment I walked out. I really liked the fact that they have good availability in terms of appointments, everything is new and clean, and the way they treated me make me feel so comfortable. One of my big fears when going to the dentist is being told everything I’m doing wrong-but not once did anyone here make me feel embarrassed or ashamed! Dr. Koh was giving me well-detailed consultation, and a very honest treatment plan about my teeth. I was able to overcome the prejudice of the dentist since I saw Dr. Koh. Good medical devices also help the overall health of my teeth. I’ll definitely be coming here for the rest of my life! I will definitely refer everyone I know to this practice. Thanks Dr. Koh!

Crystal Molina (Source: Google)


Finally found a dentist I like! Dr. Koh and her staff are great. Went in for a cleaning and had some concerns about a cap I had and she addressed it and acknowledge that there was something wrong with it and it needed to be replaced. It was easy to make an appointment and they worked with me on the payments of the replacement cap. I would definitely recommend Dr. Koh yo anyone looking for a new dentist!

Carrol V. from Laguna Niguel, CA (Source: Yelp)


Dr. Koh is an excellent dentist.  She is knowledgeable, compassionate and thorough.  I suffer from dental anxiety.  Dr. Koh went out of her way to make me feel safe and comfortable.  She is extremely kind, calming and patient.  She took the time to explain everything before she started.  She continually checked on how I was feeling through the entire procedure.  Her staff is fabulous.  They are all friendly and knowledgeable.  I highly recommend Dr. Koh.

Sheron Majeski (Source: Google)


Dr Koh is amazing. She is so kind and very gentle with my sensitive teeth. I know I will have my teeth for a lifetime under her care. The staff are amazing too. Love Christine and the others…so caring and professional!

Brittney M. from Irvine, CA (Source: Yelp)


Dr Koh and her awesome staff are just wonderful! I would recommend her dental work to anyone. The time, and expertise she devotes to her patients is refreshing. I’ve never had such superior dental work anywhere else. Her office is brand new and state of the art with all the new bells and whistles. You are truly confident and comfortable the moment you step foot in her gorgeous office. Her knowledge of dentistry has surpassed my expectations and I am very happy I traveled some distance to see her.

Melina V.from Anaheim, CA  (Source: Yelp)


Dr Koh and Staff are wonderful absolutely no wait.. Dr explains everything therally nice atmosphere painless dentistry …digital x-rays  great cleanings this is honestly one of the best dental offices I have been to …my two children were also very happy to meet dr Koh she was very patient with my kids thank you Dr and staff for providing great care to myself and my family

Kristyn M. from Irvine, CA (Source: Yelp)


I would like to start by saying I have despised the dentist ever since I was young. When I decided to choose Dr. Koh as my dentist, I wasn’t sure what my experience would be like especially since I try to avoid the dentist as much as I can – I always want to get it over with. When I had my first appointment, the staff was very nice and greeted me instantly and I barely had to wait to be seen. It was a quick yet thorough cleaning and had to schedule a second visit for my fillings. The staff was very accommodating to my work schedule and made it a very simple process. Yesterday was my second appointment and I’m still very happy with my experience. She made sure I was comfortable at all times and was helpful for all the questions I had. I’m glad I finally found a dentist in my area!

Jen O. from Mission Viejo, CA (Source: Yelp)


This dentist is by far the best . I have very high anxiety going to the dentist and she is very patient kind and gentle with me. The office staff is very friendly and accommodating with my work schedule.  I highly recommend this dental office .

Jon Bee (Source: Google)


The ladies there at Hee Yon Koh’s are all very nice, professional, & they know their business. Never have to wait. And most importantly no pain; easy & comfortable in their dentist chair. They’re the best! Dr. Koh is awesome!

Diana Campbell (Source: Google)


Dr. Koh is a wonderful dentist. I appreciate her honesty, gentleness, her great quality of work, in addition to how she answers my questions. I recommend her highly! She is my new dentist, and happy I found her!

Carrol Velarde (Source: Google)


Dr. Koh is an excellent dentist. She is very knowledgeable, compassionate, and thorough. I suffer from dental anxiety. Dr. Koh went out of her way to make me feel safe and comfortable. She is kind, calming and extremely patient. She took extra time to explain everything before she started. She continually kept checking on me to see how I was feeling through the entire procedure. Her entire staff are fabulous. All are very friendly and knowledgeable. I highly recommend Dr. Koh.

Leon Williams (Source: Google)


Dr. Hee Yon Koh has proven to me that she’s a star in her practice. I was terrified of going to the dentist for a root canal, but she assured me that I would not feel a thing, and you know, she was right. Kudos Dr. Koh!

Justin Lim (Source: Google)


Dr. Koh is known for dentists’ dentist. Even other dentists go to her office to get dental treatment. Based on having dental treatment from her for more than 10 years, I can confidently say Dr. Koh is the best dentist. Her skills are A+! I understand why other dentists want to visit her. All staff in the office are so kind and helpful. Highly recommend for your real mouth peace in La Paz!

Stephanie Won (Source: Google)


I have been going to Dr. Koh for several years and I am so glad she opened a dentistry nearby me! The facilities are pretty nice and clean. Most importantly Dr Koh is skilled and experienced. I strongly recommend her.

Leticia Q. from Glendale, CA (Source: Yelp)


Great doctor . My procedure was painless . I’m usually anxious when I go to the dentist but she made me feel comfortable and she explained in detail what I needed . I recommend Dr Koh to everyone. The anesthetic part was painless. Thanks Dr Koh I really loved the quality of your work.

Lina Vidaurre (Source: Google)


My husband is not a fan of dentist .. he is very happy with Dr Koh care painless and loved how she explained all recommended treatment she took her time numbing and during the procedure .. I am in the dental field I felt that Dr Koh would be perfect for my husband dental care I also like the great office hours and wonderful care she provides to her patients Thank you Dr. Koh!

Jim Cooper (Source: Google)


Love the facility, staff, and Dr Koh. The facility is small, clean, modern and comfortable while the staff is welcoming, helpful, & gives off a family felt environment.  This place was recommended to me by a co-worker. Drive out of town from where i stay, but overall very good service, extremely professional staff.

K. Cappasola (Source: Google)


I have major dental fears, which in the past led me to not taking care of my dental needs.  Thanks to Dr. Koh and her staff for being so professional and kind during my Dental treatments. I feel completely comfortable in her office and no longer feel the stress of visiting the dentist. I Highly recommend Dr. Koh and wish I could give her 100 gold stars 🙂

Thomas Rolapp (Source: Google)


Dr.Koh and her staff are wonderful!  From the front office to the back of my mouth, the whole experience is pleasurable and painless. Dr Koh is a fast, gentle artist…and she’s fun! I highly recommend you put your dental health in her hands and office.

Leonardo Huerta (Source: Google)


Great, friendly staff! Made me feel extremely welcome from the first day I came in. Dr. Koh makes sure to explain everything that she will do with great detail, which is extremely helpful! She is very careful and does excellent work!

Emma T. from Mission Viejo, CA (Source: Yelp)


Does Yelp delete my review? I gave my Dentist 5 star review not too long ago, and it is gone now. hmmm. I went to see Dr Koh today for my follow-up visit, and again everything went smooth and nicely. My new crown looks much better than before and no sensitivity at all. I am definitely coming back to see Dr. Koh and will recommend everybody to come to this office.

Lisa Clark (Source: Google)


Dr. Koh and her staff are amazing. Everybody us very friendly, provides a comforting/professional atmosphere . They go above and beyond to provide excellent care.

Jennifer Witz (Source: Google)


Dr. Koh and her staff are highly professional. Her office is equipped with the latest technology. I was very impressed with the consultation, procedure, and follow-up care. Dr. Koh is friendly, and she carefully explains options for consideration. I am very pleased with the care, follow up, and dental care plan I received. Dr. Koh is highly recommended and has become our trusted family dentist.

Adams M. from Mission Viejo, CA (Source: Yelp)


I’ve always hated going to the dentist but Dr. Koh and staff make it so much better. To schedule an appointment was easy and the front desk lady was very nice. The wait time are almost none. Dr.Koh made me calm since I had been suffering from bad pain from other dentist’s work. She was very honest and so competent with the procedure. Highly recommended for anyone looking for new dentist!

Elizabeth Gomez (Source: Google)


Our whole family sees Dr. Koh. She is good with both kids and adults. Christine does all the scheduling and billing and is amazing! She not only works beautifully with our insurance, but knows our family by name and does wonders to get us in amidst our crazy schedules!

Kate Kim (Source: Google)


Perfect example of a good neighborhood dentist. The staff is amazing and make me feel welcomed and at home. There is always a smile and they treat me with kindness. Dr Koh is great at what she does. She’s professional but amicable and has a very gentle touch. I hate dental work, but at this office, I have no fear.

Anthony Deol (Source: Google)


I’ve always hated going to the dentist but Dr. Koh and staff make it so much better. To schedule an appointment was easy and the front desk lady was very nice. The wait time is almost none. Dr.Koh made me calm since I had been suffering from bad pain from other dentist’s work. She was very honest and so competent with the procedure. Highly recommended for anyone looking for a new dentist!

Daniel K. from Irvine, CA (Source: Yelp)


I can’t hardly say if 5 stars are enough for Dr. Koh!!!!! Dr. Koh. I guess I can start by saying that five stars review can’t really explain quality of her work. I had been having a lot of trouble with one of my front teeth for a few years and it was a true nightmare. I was hesistant with every dentist I went to when I had to get work done because of all my previous experiences had not been enough to make me satisfied.But I have to say my stereotype was unintentionally broken by Dr. Koh. Dr. Koh and her team were so caring and accommodating I couldn’t  help but give them my 100% trust! I have to say that trust paid off because my front tooth looks like never before! I had to get a crown and the crown is a perfect match with all of my other teeth! And when I say perfect I mean PERFECT! I was shocked and blown away by her work. All that I have left to say now is THANK YOU to Dr. Koh and her team! She is just the best dentist in the world!!!!

Mikayla Dobson (Source: Google)


Dr. Koh and her staff are wonderful! I always feel so welcomed whenever I come in and my teeth are always in the best hands.


Our practice is conveniently located in the heart of Mission Viejo on Marguerite Parkway. We have plenty of parking space in our lot and we're easy to reach by bus (lines 85, 86, 182). For years, we have been serving families throughout the Ladera Ranch, Lake Forest, and greater Mission Viejo communities. We strive to accommodate the busy demands of your schedule and offer alternating morning and evening availability during the week. We're also conveniently available by appointment on Saturdays. As part of our commitment to your continued oral health, we offer same day emergency treatment for patients at any age. The entire team at the office of Clara Koh, DMD strives to provide our patients with an exceptional dental care experience. To learn more about our services, participating insurance, or the next available appointment times at our Mission Viejo dental office, contact us today! Dr. Clara H. Koh received her BA in telecommunications at the Pennsylvania State University. She then obtained her doctorate degree in dentistry at University of Medicine and Dentistry of New Jersey (UMDNJ) in 2006. For her superior achievements, Dr Koh was selected to the Dean's list for 4 years in dental school. After earning her dental degree, Dr Koh continued to further her studies and enhanced her clinical skills with the completion of her residency program at Columbia University Presbyterian Hospital, New York in 2007. The program focused on highest quality general, cosmetic and restorative dentistry, including root canals, crowns and bridges, fillings, implants, dentures and emergency dental services. Then, she practiced in NJ and NY for 4 years. She moved to CA and has been in private practice to provide comprehensive dental care in Pasadena and Covina. She is now proud to open her practice in Mission Viejo, CA and is looking forward to serving her local community.