About Our Doctors

Our Pediatric Dentists


Kathleen A. Siu, D.M.D. | Dean Schweitzer, D.D.S.

Dean Schweitzer, D.D.S. began his practice in Santa Clarita in 1980, and nine years later, he was joined by Kathleen A. Siu, D.M.D. Dr. Schweitzer and Dr. Siu, both graduates of the University of California, Los Angeles, were classmates during their residency training in pediatric dentistry at the University of Southern California. Together they continue to provide the children of Santa Clarita with the highest level of pediatric dental care available.

Our primary concern is the well-being of our patients. We strive to keep our patients happy and comfortable at all times when they are present in our office and ensure that their childhood dental experiences are favorable. The parents of our patients are also very important to us, and we make every effort to keep them informed, to respect their time by staying on schedule and to be available to them whenever the need arises.

Our Orthodontists

Jason Pair, D.D.S.

Krisena Borenstein, D.M.D.

After graduating from UCLA with a B.S. in physiologic sciences, Dr. Jason traveled north to dental school where he attended UC San Francisco, graduating with honors and being elected into Omicron Kappa Upsilon. He completed his orthodontic residency at UCLA, where he was chief resident. His research project was published in the American Journal of Orthodontics & Dentofacial Orthopedics, the leading peer reviewed journal in the profession. He has also had 2 Case Reports published since graduation demonstrating treatment of unusual orthodontic conditions. Once a Bruin and always a Bruin, Dr. Jason currently leads treatment planning seminars at the UCLA Orthodontic Residency Program with Dr. Borenstein, and serves as a clinical instructor. He has also continued clinical research with the residents of UCLA.

Dr. Jason is past President of the San Fernando Valley Dental Society and he currently serves as an Orthodontic Peer Review member. He is a member of the American Association of Orthodontics. He is a Diplomate of the American Board of Orthodontics and an Angle Society member. He has lectured extensively outside of UCLA including the California Society of Pediatric Dentistry Annual Meeting in Portland, Oregon and to the faculty and alumni of University of Marroquin in Guatemala.

Dr. Jason has 4 four children and with his wife, Janette, they love to travel and hike. Dr. Jason also enjoys surfing, skiing, photography and woodworking. He has participated in various volunteer dental organizations, traveling to Guatemala, Mexico and Israel.

After dental school at the Harvard School of Dental Medicine, Dr. Borenstein completed a three-year residency in orthodontics at UCLA, where she earned a master's degree in oral biology, as well as her certificate to practice as an orthodontic specialist. She has also been given the opportunity to work as a faculty member at the UCLA School of Dentistry in the Orthodontic Department. She finds it very rewarding and fun to work directly with the current orthodontic residents in the clinic. Both Dr. Borenstein and Dr. Jason run a treatment planning seminar for the UCLA residents. She attends many continuing education meetings and conferences. Her mission is to stay up to date with the latest technology in the field in order to provide the best care for her patients.

Dr. Borenstein is a member of the American Association of Orthodontics, the Pacific Coast Society of Orthodontics, and the Academy for Orthodontic Excellence, as well as other orthodontic study clubs.

Dr. Borenstein and her husband have 2 children. As a family they love spending time at the beach. She also enjoys skiing, traveling and trying new restaurants. She is also involved with the Luminaires, a charity that raises money for the Doheny Eye Institute, whose mission is to conserve, improve and restore human eyesight.

Our Dentist for Adults

Brian Gradinger, D.M.D.

Brian Gradinger, D.M.D. was personally selected by Dr. Schweitzer to provide dental services to the adult patients of our practice. Dr. Gradinger was chosen because of his exceptional clinical skills, keen sense of professionalism and warm, friendly personality.

Dr. Gradinger graduated from Western University Dental School and follows in a long family dental tradition. Both Dr. Gradinger's father and grandfather are dentists which provided him with a strong foundation in the dental profession. Dr. Gradinger is highly proficient in all phases of clinical restorative dentistry and takes great pride in meeting the dental needs of all his patients.

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Hours of Operation

*We take lunch from 12:30am-2:00pm (Mon, Wed, Thu) and 11:00am-12:30pm (Tuesday)


8:30 am-5:00 pm


7:00 am-3:30 pm


8:30 am-5:00 pm


8:30 am-5:00 pm