2400 Clay Street
San Francisco, CA 94115

Mon - Fri: 8:30AM - 6:00PM

Sat: By appointment only

Sun: Closed

96.3% would refer friends and family to us

4 stars Customer since 2017

I appreciate the focussed care the doctor provided. However, It was pricey by similar standards. I would probably return when considering more advanced and dramatic procedures.

5 stars Customer since 2017

Dr. Maas has incredible finesse and judgement with fillers making me look soooo natural...just better! Staff was also very friendly and accommodating. Thank you!!!

5 stars Verified customer

Friendly, knowledgeable staff with concern for my comfort.

5 stars Customer since 2004


5 stars Customer since 2003

Thank you so very much ! I had an IPL today and the whole experience was professional, on-time and very pleasant. I am looking forward to the results !!!

5 stars Verified customer

Very patient and personable. Makes me feel very comfortable!

5 stars Verified customer

Corey Mass and his team, are exceptional!

5 stars Customer since 2012

She is so positive and explains everything. I had Cool Sculpt yesterday on my upper arms. I love Dr. Maas, the center, his staff. I Trust them implicitly!

5 stars Verified customer

From the first visit to my most recent appointment I was 100% pleased with the staff, Dr. Maas and my procedure. In my opinion there is no room for improvement.

5 stars Customer since 2016

The staff and Dr. Mass are very professional and caring. I feel like I am in great hands when I arrive at my appointments.

Also in San Francisco


Vivian W. Cui, D.D.S.

5 stars 737 reviews

This visit with the hygienist did not live up to your high standards nor with my past experiences with other hygienists in your office. She seemed inexperienced and the only term I can think of is "sloppy." I asked for the nitro when she brought me into the exam room and was told, "No, we are not doing that today." I asked if there was any reason why not and she did then go and ask somebody. Eventually, I was hooked up, although I had the feeling she was not quite sure what she was doing. At one point, I felt like to confessing to all crimes because I was swallowing more water than she was being pulled out by the tube...sort of like waterboarding. In all seriousness, I adore Dr. Coi and the fact that I can bring Leila. I love the office and everyone in it, except my last hygienist. If she is still there for my next visit, please do not schedule me with her.
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5 stars 628 reviews

100% would refer friends and family to us