Welcome to Our Practice


Welcome! The dental professionals at Prospect Dental Care are pleased to welcome you to our practice. We want all our patients to be informed decision makers and fully understand any health issues you face. That's why we've developed a website loaded with valuable information about dental problems and treatments. We encourage you to visit this site whenever you have concern about your teeth.

Our website also provides you with background about our staff, office hours, insurance policies, appointment procedures, directions to our office in and other useful information. We know how hectic life can be and are committed to making our practice convenient and accessible. We want you to feel confident that you're working with doctors and other professionals who are qualified, experienced and caring.

Please take a few moments to look through this site to get a better feel for Prospect Dental Care's capabilities and services. We also invite you to email or call our office to request an appointment or ask any questions. Thank you.

Exclusive Offer

Free Consultation for Patients with No Insurance

Meet Our Doctors

Learn Who We Are

  • Koushyar Keyhan,

    Dr. Keyhan has over 20 years of experience in clinical dentistry. He graduated in 1998 from McGill University in Montreal, Canada and subsequently completed a 2 year General Practice Residency (GPR) in Brooklyn, New York. He then moved to San Jose, California and entered into private practice, while being a part-time clinical instructor at UCSF School of Dentistry.

    Read More
  • Siamak Madani,

    Dr. Siamak Madani is a specialist in the fields of periodontics and dental implants. He completed both his dental school training and specialty program at the University of Pennsylvania in Philadelphia, PA.

    Read More
  • Sheila Nguyen, DDS, MS
    Board-Certified, Pediatric Dentist

    Dr. Sheila Nguyen has been part of the multi-specialty team at Prospect Dental Care since 2017. She is a Bay Area native. Growing up, she was a student-athlete, receiving her high school diploma from Saint Francis High School and her Bachelor of Science degree in Human Biology from the University of California San Diego (UCSD). 

    Read More
  • Alan Chee,

    Dr. Chee is a second generation dentist from San Francisco. After completing his undergraduate studies at UCLA, he earned his DDS at the University of the Pacific and completed a 1-year general practice residency at the Jesse Brown VA in Chicago, IL.

    Read More
  • Tiffany Bui,

    Bio Coming Soon...

Featured Articles

Read about helpful topics

  • How Long Does the Coronavirus Live on Surfaces?

    The coronavirus that causes COVID-19 mainly spreads from person to person. When someone who is infected coughs or sneezes, they send droplets containing the virus into the air. A healthy person can then breathe in those droplets. You can also catch the virus if you touch a surface or object that has ...

    Read More
  • The Power of Hand-Washing to Prevent Coronavirus

    The single most important piece of advice health experts can give to help us stay safe from COVID-19 is this one: Wash your hands. "In the final analysis, it's the hands. The hands are the connecting piece," says Elizabeth Scott, PhD. Scott co-directs the Center for Hygiene and Health in Home and Community ...

    Read More
  • Do I have COVID-19 or a cold?

    Do I have COVID-19 or a cold? If you don't have a fever and your eyes aren't itchy, it's probably the common cold, not COVID-19. Do I have COVID-19 or allergies? It's probably allergies -- not COVID-19 -- if you don't have a fever but your eyes are itchy, you're sneezing, and you have a runny nose. How ...

    Read More
  • How to Weather Social Isolation

    Social distancing has become the new normal, with one-third of Americans now under stay-at-home orders due to the coronavirus pandemic, but experts say that level of isolation can be hard on your health. "We don't know for sure what the long-term health outcomes of widespread forced social isolation ...

    Read More
  • Coronavirus: What You Need to Know

    The new coronavirus epidemic that started in Wuhan, China, in late December is now in dozens of countries, including the United States. Here are answers to key questions about the virus, including how to protect yourself and what to expect. What are the symptoms of coronavirus? According to the CDC, ...

    Read More
  • Coronavirus: Is It Safe to Get Deliveries?

    With more than 50% of the U.S. population living under stay-at-home restrictions, companies that deliver food and household goods are inundated with orders. As they scramble to meet the demand, you may wonder if ordering in puts you or the people making your deliveries at risk. The Question of Worker ...

    Read More
  • Coronavirus Myths & Facts

    As Coronavirus Myths Multiply, Experts Sort Fact From Fiction The new coronavirus continues its steady march through the U.S. population, bringing with it a second plague: potentially dangerous myths and rumors about COVID-19, spread via the internet. You may have already heard some of these coronavirus ...

    Read More
  • Avoid Coronavirus Misinformation

    A Doctor's Tips for Spotting Fake COVID-19 News As we all try to stay safe from COVID-19, arming yourself with accurate news information has never been more important – but it’s not always easy. Fake news can be challenging to recognize because there’s often a little truth mixed in with misinformation. ...

    Read More
  • Calming Your Child's Coronavirus Fears

    Schools are closing. Sports and other activities have been cancelled. Everything is changing. In the midst of this chaos, how do parents keep kids from stressing too much? "For families, this is truly now hitting home," said psychologist Robin Gurwitch, from Duke University and the Center for Child and ...

    Read More


What Our Patients Say About Us

    I would prefer never having to go to the dentist but when I have to I insist on seeing Dr. Keyhan and his helpful staff!  Dr. Keyhan is very detailed in his work and takes the time to explain the procedures and options carefully.  You will immediately benefit from his passion for dentistry and years of experience.  This type of genuine patient care is definitely becoming increasingly rare these days!

    Mr. N. A.

    Dr. Keyhan is a very knowledgeable and pleasant.  In every visit you feel confident that you are in great hands, that he is in complete control of the work and is making the right recommendations to you.  As an engineer I pay attention to details and admire those who do so as well.  Dr. Keyhan’s attention to details in his work is very commendable.  I would recommend Dr. Keyhan to anyone looking for a great dentist and would be more than happy to discuss it in more details. 

    Mr. M. B.

    I’ve personally known Dr. Keyhan for several decades and he has been my dentist for the past 10 years.  I am always impressed by the amount of attention and time he devotes to each individual patient.  His knowledge, expertise and experience are highly admirable and shine when he explains treatment thoroughly and professionally.  I am confident that Dr. Keyhan’s passion for density is one of the key elements of his success.

    Dr. D. A.

    I feel asleep while he was working on my teeth....
    And he is not about getting the most $$ out of you. I went to him because a previous dentist had told me I needed some 25 feelings and 3 root canals, and 7 crowns. Well, turns out i needed 9 feelings, with no root canals, and no crowns.

    Definitely recommend this guy.

    C. J.

Our Location

Find us on the map

Hours of Operation

Our Regular Schedule


8:30 am-5:30 pm


8:30 am-5:30 pm


8:30 am-5:30 pm


8:30 am-5:30 pm


8:30 am-5:30 pm


Limited Service