Welcome to Our Practice in Saratoga, CA


Welcome to Prospect Dental Care, where we are committed to providing you with the best dental care. Get to know our dedicated team and what sets us apart.

Our website also provides you with background about our staff, office hours, insurance policies, appointment procedures, directions to our office and other useful information. We understand life can get hectic 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.

Core Values

  • Comfort

  • Availability

  • Relationship

  • Excellence

  • Helpful

  • Responsive

  • Patient

  • Compassionate  

  • Reliable

  • Satisfaction


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.

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  • 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.

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  • 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). 

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  • 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.

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  • Tiffany Bui,

    Bio Coming Soon...

  • Betsy Duell,

    Dr. Duell received her B.A. in psychology from University of California, Los Angeles, her D.D.S. from New York University, NY and her Pediatric Dental Specialty Residency from University of Southern California / Children’s Hospital of Los Angeles.

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Featured Articles

Read about helpful topics

  • Bridges

    When you lose a tooth, it affects not just the appearance, but the function of your smile. It can be difficult to eat or speak naturally, extra stress is put on your remaining teeth, you’re at greater risk for developing gum disease, your remaining teeth can shift out of position causing bite problems, ...

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  • Fillings

    The bacteria in plaque produce acids that erode tooth enamel, eventually creating a hole, or cavity, in the tooth surface. Left untreated, this decay can spread to the interior of the tooth, and might lead to the need for a crown, a root canal, or even extraction. When caught early, your dentist can ...

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  • Veneers

    A dental veneer is a thin, durable porcelain shell that is custom-fabricated to cover the front of a tooth. Veneers can restore the appearance of teeth with chips, cracks, and stains, can close small gaps between the teeth, and can reshape misshapen or slightly misaligned teeth. Veneers are a popular ...

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  • Root Canal Treatment

    Every tooth has two sections: a crown, the visible part of the tooth above the gum line, and one or more roots, which anchor the teeth within the jaw. Each tooth has three basic layers: an outer layer of hard enamel (which protects the crown) or cementum (which covers the root), a middle layer of softer ...

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  • Dental Implants

    If you have recently dealt with an injury or disease that affected your oral health, there are options available to recover the smile you once had. You may even be able to achieve a better smile than the one you had. Dental implants make it possible to renew your smile if you have lost some teeth. There ...

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  • Orthodontic Retention

    Getting your braces off is definitely a cause for celebration. You can finally enjoy your new smile after all that work and effort! But getting your braces off isn’t the end of treatment. Once your braces come off, you will enter the retention period of treatment. During the retention period, you will ...

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  • Tooth Decay Prevention

    What is tooth decay? Tooth decay begins with the Streptococcus mutans bacteria. These bacteria join with food particles and fluids in the mouth to create plaque, a constantly forming biofilm which sticks to the surface of tooth enamel. The bacteria in plaque convert the sugars in our foods into lactic ...

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  • Educational Videos

    Take a few minutes to watch our educational videos and learn more about different dental treatments and procedures. Video topics include general & cosmetic dentistry, Implants, oral health and hygiene, orthodontics and preventative dentistry. ...

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  • Inlays and Onlays

    Inlays and onlays are indirect restorations used to repair molars and premolars damaged by decay or trauma. Inlays and onlays fit more securely and last longer than fillings, strengthen compromised teeth, and preserve more natural tooth structure than crowns. An inlay is used to restore the center of ...

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What Our Patients Say About Us

    Dr. Keyhan's thorough examination demonstrated his excellent knowledge of dentistry. He explained each step of the process in a clear and concise manner, ensuring my comfort, and his attention to detail was remarkable.


    Definitely the best dentist office around! Love the staff and my teeth are always well taken care of. They’re honest and super welcoming with their patients. 5 stars!!!!


    Very clean office and the waiting room has a very relaxing vibe to it. I would recommend this office to anyone who’s looking for great dental work and care!


    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