Welcome to Our Practice

Welcome to Peak Dental Specialists, Your Dentist in Glendora, CA

Welcome! The dental professionals at Peak Dental Specialists 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 web site loaded with valuable information about dental and dental problems and treatments. We encourage you to visit this site whenever you have a concern about your teeth.

Peak Dental Specialists places a high priority on equipping our office with the best tools and technology available. Our modern facility boasts state-of-the-art technology designed to help our specialists provide our patients with the best dental care possible.

Our team embraces innovation and we are always looking for the latest developments in the field of dentistry. We are constantly upgrading our equipment and technology to better treat our patients.

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Meet Our Staff

With over a decade of combined experience, our specialists are committed to giving you the great smile you deserve.

  • Tony Li
    DDS, MD
    Oral Surgeon

    Dr. Tony Li grew up on the peninsula in Northern California in the city of Belmont. He attended college at UC Berkeley studying molecular biology. Dr. Li then attended UCSF School of Dentistry and graduated in 2008. He subsequently moved to the east coast and completed a 6 year integrated Oral & Maxillofacial Surgery Residency/MD program at the University of Pittsburgh in Pittsburgh, Pennsylvania. He graduated medical school in 2012 and completed surgical residency in 2014. Dr. Li then completed a fellowship in Cranio-maxillofacial trauma at Legacy Emmanuel Hospital in Portland, Oregon in 2015.

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  • Robert Keshishian
    Exodontist - Oral Surgery

    Southern California raised, Dr. Keshishian attended California State University - Northridge for his undergraduate degree in Biology with a sub-speacialty in Cell and Molecular Biology. Upon completion, he matriculated into Herman Ostrow School of Dentistry of USC's Doctor of Dental Surgery program
    During his time at USC, Dr. Keshishian served as Vice President of the Oral Surgery selective program as well as participating in the Special Patients elective clinic where he treated medically complex patients. 

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  • Thaer Alqadoumi
    DDS, MS

    Dr. Alqadoumi received his first DDS degree from University of Jordan in 2012, then he received another DDS degree from Loma Linda University in 2016.

    Received his post-graduate training in Loma Linda University in Periodontics & implant surgery, where he received his MS degree. 

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  • Michael Lee

    “Nothing gets me more excited than seeing a patient view their new smile for the first time after treatment is completed. It is truly a pleasure being able to meet and establish lifelong connections with so many people from different walks of life while transforming their smile.

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Office Location:

210 S Grand Ave, Suite 308 Glendora, CA 91741

Hours of Operation

Peak Dental Specialists is open five days a week. Our hours of operation are:


8:00 am-5:00 pm


8:00 am-5:00 pm


8:00 am-5:00 pm


8:00 am-6:00 pm


7:00 am-4:00 pm