When you visit our Sunnyvale office, your smile is our top priority. Our entire team is dedicated to providing you with the personalized, gentle care that you deserve. We have served the Sunnyvale area from this location for the past Ten years. Read our Reviews! Part of our commitment to serving our patients includes providing information that helps them to make more informed decisions about their oral health needs. This website is a resource we hope you’ll find both useful and interesting

Patient reviews

All reviews have been submitted by patients after interacting with the practice.

Overall rating

4.85

Wait time

4.83

Bedside manner

4.89

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

172 reviews

Most relevant

Very happy with my experience with Dr. Dini. Friendly office staff and very thorough physician. Highly recommended.

May 19, 2025Bryce B.Verified patient

It was a very easy experience finding a dentist within my network. The office was easy to find an staff was very friendly.

October 19, 2023Mi H.Verified patient

Very professional. Very concerned about my comfort which was the best part . My teeth were gleaming. Great cleaning!

February 16, 2017Pamela W.Verified patient

Friendly staff & amazing dentist! You could tell they all really care about their patients. I had a great experience!

March 4, 2021Eliane M.Verified patient

Very helpful, very professional and she gave me very good advice. I booked my next visit straight away!

February 25, 2015Georgios V.Verified patient

Dr. Dini and her staff were all very professional, helpful, honest, and caring. A great experience!

February 29, 2016Initials hidden

It was fast and easy. Everyone was nice and wanted to get the job done right away.

NSVerified patient

She was really friendly and trying to explain everything as she does it.

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She is always great...one of the most through cleanings I have ever had

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Best, kindest and gentle dentis. A true perfectionist vexcellent work

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Dr. Zarrinnegar is great! By far the best dental experience I've had!

March 13, 2015Samantha B.Verified patient

Excellent doctor and friendly staff! Highly recommend!

August 31, 2021Nima D.Verified patient

Dr. Dini and all her staff were professional and caring!

September 1, 2015Alvaro F.Verified patient

It had been 4 years since my last dental check up or appt and I was a little nervous. The staff were super nice and thoughtful, and made it all much easier to get back into regular checkups. Dr Dini was super nice and I was really impressed with the whole experience. I highly recommend!

October 23, 2023Sarah L.Verified patient

Very professional, great bedside manner. I think the staff was wonderful. I didn't have to wait long very friendly. They made me feel very comfortable. I felt that the dentist was extremely knowledgeable on her craft, including explaining in detail what she was doing and why I think that's a great dental office and I look forward to continuing to work with her. I definitely recommend her.

May 25, 2023Jennifer B.Verified patient

Doctor DIni was the consummate professional and dentist that exceeded my high expectations! I was met with pleasant professionals both before my treatment by the staff and then by Dr. Dini herself who gave me the best exam and treatment that I ever experienced in my very advanced age! My highest recommendation are gratefully given!

May 23, 2023Rene A.Verified patient

100% recommend, fantastic care, professional and friendly staff, and I got all my questions answered before and after my procedure.

February 5, 2023Initials hidden

I got the dental cleaning done that was covered and accepted by my insurance. The office was aware of my appointment and the check-in was smooth. This was my first appointment with the doctors and my previous dentist ahve been very slow and gentle with explaining what they will do, how they will do and doing it gently with pauses and breaks. This time I felt a lot rushed, had to ask for pauses in between the cleaning procedure, if at all. My entire mouth and gums feel strongly impacted as it was not as gentle as I have been use to in my previous dental visits. My questions on how long to wait before I can brush were not clearly answered and also no recommendations were made on how much to wait before I eat or drink.

March 23, 2022Initials hidden

Dr. Mary Dini was pleasant and efficient as my dentist. It was my first time visiting. She chatted with me a bit while doing my cleaning and seemed to elegantly time when to give me a break to suction out all of the water/spit so that I would be able to respond to the low pressure conversation. I appreciated seeing my x-rays on the screen right in front of me as I got into the chair and Dr. Dini answered all of my questions. The only complaint I have is that I received a call ahead of my appointment to answer questions that I already responded to via Zocdoc.

November 1, 2021Cary L.Verified patient

Dr. Dini and her staff make you feel welcome, informed, and comfortable during your visit. Iris was my hygienist, and she was very friendly, attentive and thorough. It was great coming back here after several months of being away since the pandemic began. It was like visiting family!

October 14, 2021David P.Verified patient

very professional, friendly, makes you feel comfortable about what is coming.. Nobody really likes going to the dentist, but DrDini definitely made the best of it. Clearly explaining the process and treatment..

September 28, 2021Miguel T.Verified patient

Dr. Dini is AMAZING. She's super nice and does a great job cleaning. Loved chatting with her as well. I can't wait to go back!!

May 3, 2021Caresse C.Verified patient

Really good dentist.

March 25, 2021Frances D.Verified patient

Dr. Dini is by far the best practice I have visited! She is professional and incredibly skilled. She is also friendly and willing to work with you. I highly recommend!

December 10, 2019Jacqueline R.Verified patient

Everyone in the office was really kind and made sure my experience was really comfortable and smooth. I didn't think twice about booking my next appointments and I would definitely recommend the San Mateo office to anyone in need of a new or better dentist!

March 18, 2019Julia S.Verified patient

Dr. Dini and her staff are wonderful! I have extremely sensitive teeth, and though I felt some pain, they made me feel comfortable and were very kind.

January 8, 2019Lisa M.Verified patient

Mary is a very kind lady and genuinely friendly. She conducted a thorough examination of my oral health, explained everything to me as she went along and gave honest advice based on urgency of any issues and insurance allowances. I am new to the Bay Area and decided to try Mary based on other positive reviews and I can safely say I was not disappointed. Highly recommend.

June 30, 2018Paul H.Verified patient

Wonderful experience! She is so professional and friendly. I had the most thorough cleaning ever. Already booked my next appointment :)

April 10, 2018Elnaz D.Verified patient

Wonderful experience! Will definitely return!

August 11, 2017Katherine R.Verified patient

It was a great first visit.

January 23, 2017Roshie M.Verified patient

Dr. Dini was very nice and friendly during my evaluation and cleaning. I knew I had an issue with a molar, which is why I went in. I need to go back for a crown process, hopefully its not too painful :(

September 22, 2016Mark F.Verified patient

The dentist is not my favorite thing - but was so relieved by my experience with Dr. Dini and her excellent hygienist Iris! I had an acute problem and they made arrangements to help me immediately as I am traveling! Excellent and thorough care.

August 23, 2016Anne-marie C.Verified patient

I have been a patient of Dr. Dini since 2000. I found her at a new office (July 2016) returning after I had received an unsatisfactory exam at a different dental provider. I was treated with the utmost professionalism, and care. She is trustworthy, happy and caring and a very good, & smart dentist. You could not go wrong.

July 19, 2016Thomas P.Verified patient

Great!

February 15, 2016Andrew B.Verified patient

Dr. Mary Dini and everyone in her office were extremely friendly and patient with me. I am looking forward to going back to her office again!

February 21, 2016Frances S.Verified patient

Excellent and friendly !

March 2, 2016Atin H.Verified patient

The x-Ray mouth piece didn't fit in my mouth and was very uncomfortable to bite down on.

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He was very pleasant, and walked me through some of my gum issues and future treatment.

Vincent N.Verified patient

I had a great experience at my dentist office. Their work is really good, and they always do a fantastic job. Plus the staff is super nice and makes you feel comfortable. Highly recommend!

April 19, 2025Mohammad K.Verified patient

My experience as a patient of Dr Zerrinnegar was very negative. My front tooth needed some work, the doctor did it in a rush and chipped it on the side, leaving a permanent, visible damage that was not there before. When I tried to go back to solve it, I scheduled an appointment online and took a long trip there, only to find out that he was not in the office. I decided to see a different dentist, after incurring in so much unprofessional inconvenience from Dr Zerrinnegar.

January 18, 2025Roberta B.Verified patient

Such a personable and knowledgeable dentist. Excellent credentials and extensive experience without the ego. Dr Z. suggested an optimal treatment plan without being hasty or jumping to a costly (and painful) treatment. I look forward to my next visit in 4 months.

Mehdi D.Verified patient

Our visit to Dr. Mohammed was great. He pays attention to small details and takes the time to listen to our concerns (which as you know isn’t always the case...)

June 21, 2020Initials hidden

Dr. Zarrinnegar is one of the very best dentists I have seen. He is extremely knowledgeable, he helped me with my implant. He was very efficient and understanding in scheduling and doing my implant. Excellent doctor. Absolutely recommended.

Behnam Z.Verified patient

I was very well treated by Dr. Mohammad Zarrinnegar and his assistant as they took x-rays and performed dental cleaning. They were professional, and it also felt as if they cared about me and my specific needs. I'm very satisfied with my visit and would recommend their establishment.

April 12, 2018Niklas L.Verified patient

Awesome doctor! Very professional and HONEST.

February 16, 2017Mehnaz B.Verified patient

Office employees were very friendly and professional. Dr. Z did a great job with my teeth, and had a very reasonable plan for the future care of my teeth. I have been a satisfied patient since about 2003.

July 28, 2016Doug R.Verified patient

Mohammad was extremely knowledgeable, and he saved me a root-canal by only doing a filling. He was very efficient and understanding in doing my filling. Excellent doctor. I'm new to US. I've decided to go to him for any other dental issues from now.

June 25, 2016Sreenivasan A.Verified patient

Very understanding of the fact I hadn't been into the dentist for a while, and of the fact that I had a heavy gag reflex (including various workarounds). Clearly explained every step of the procedure.

May 5, 2016Lenore B.Verified patient

Fast, friendly, and professional.

April 25, 2016Andrew S.Verified patient

Professional, forthcoming and honest about treatment and prices, good referrals to other specialties, good priortization about plan of care.

ETVerified patient