Dr. Joon Y. Lee, Dr. Jong Lee’s first son, was raised in Southern California. He attended the local schools in Diamond Bar and found a passion for dentistry at an early age. He studied hard and was accepted into USC’s competitive and prestigious accelerated six-year dental program after graduating from Diamond Bar High School in 1992. He received his Doctor of Dental Surgery degree in 1998 from the USC School of Dentistry and continues to stay current with the latest trends and procedures in the dental profession.

Dr. Joon Lee makes patient comfort and safety a main priority. He has a wide range of experience in the different areas of dentistry including but not limited to cosmetic and restorative dentistry and surgical and root canal treatments.

His approach to your treatment starts with patiently listening to you. Then, after a complete and thorough examination, he reviews and discusses the diagnosis and treatment options with you. It gives him great joy in providing his patients with the best all the while addressing their questions and concerns.
Dr. Joon Y. Lee, D.D.S.
Dr. Joon Lee practices full-time in the main office in Diamond Bar. Dr. Joon Lee and his staff make the dental visit very enjoyable. Many patients state that they feel very welcome in the office. He, along with his father, was a great mentor for the younger Lees to model their dental journeys after.

Dr. Joon Lee is affiliated with the American Dental Association (A.D.A.), California Dental Association (C.D.A.), Tri-County Dental Society, USC Alumni Association, and Korean American Dental Association (K.A.D.A.).
Dr. Joon Lee enjoys watching sports, spending time with his family and friends, and working out. He has a personable and friendly demeanor that all patients adore!
Dr. Sung W. Lee, D.D.S.


Dr. Sung Lee was born in Dayton, Ohio, and raised in Southern California. He, like his older brother, was accepted into USC’s esteemed accelerated six-year dental program immediately after completing high school in 1994. Dr. Sung Lee obtained his Doctor of Dental Surgery degree from the USC School of Dentistry in 2000.

After graduation, Dr. Sung Lee became an associate dentist for several years before opening his practice in Chino Hills, CA. Recently (Summer 2010), he relocated into a new dental suite where he takes joy in providing the best care and comfort for his patients. His patients find him and his staff to be very kind, gentle, and professional. His new practice is a true beauty!
Dr. Sung Lee is a very active resident in the Chino Hills community. His professional affiliations include the American Dental Association (A.D.A.), California Dental Association (C.D.A.), Tri-County Dental Society, the USC Alumni Association, and the Academy of General Dentistry.

In his free time, Dr. Sung Lee enjoys spending time with his family and friends, golfing, and reading. He loves meeting new people and would love to meet you as well!


“From My Family To Yours...”

It brings me joy to be given an opportunity to be a part of this growing community in Chino Hills. I have been practicing dentistry for about three years and am now taking the next step in my professional career of building a practice and growing with the families of patients that should walk through our doors. My story begins with my father, Dr. Jong M. Lee, an established dentist in the Diamond Bar community since 1982. He, along with my supportive mother, Jackie Lee, raised my two older brothers and me in the local schools and taught us the value of good work ethic and morale. Interestingly, my two brothers, Dr. Joon and Dr. Sung Lee, and I all ended up becoming dental professionals.

As a kid, I was always intrigued with the healthcare industry. My father’s relationships with his patients left a long-lasting impression as I was growing up. It was not until I was a sophomore at the University of California, San Diego (UCSD) when I narrowed my two career choices to become a physician or a dentist. I’ll admit that I was persuaded just a little bit when the rest of the family was so passionate about their dental careers at that time!
Dr. Sue Lee, D.D.S.
Many patients ask me why I decided to go to the UCLA School of Dentistry, whereas my father and brothers graduated from the USC School of Dentistry. I had no intention of creating any sort of drama (I really didn’t!). It was a choice that I felt was the right path for me and to this day I am proud to call myself a Bruin! It makes college football and basketball seasons fun for our family rivalry!

I am grateful that I was able to learn so much about the profession over the past three years. I am continually learning something new every day and am also currently focusing on continuing education courses in dental implantology. My goal is to be knowledgeable in the current topics in my field and to ultimately provide all my patients with the most comprehensive treatment plan that will leave them smiling and in great dental health.
Dr. Jong M. Lee, D.D.S.


Dr. Jong M. Lee began his dental career when he graduated from Seoul National University’s Dental College in South Korea in 1972. He broadened his horizons and moved to sunny California where he obtained his Doctor of Dental Surgery degree from the USC School of Dentistry in 1979.

Dr. Lee started his first private practice in 1982 in Diamond Bar, CA, where he was one of the few dentists to serve the community with a big and welcoming heart. He quickly became one of Diamond Bar’s active residents, always supporting the local city, schools, and community programs. He supported the Diamond Bar Chamber of Commerce, Diamond Bar Improvement Association, the Multicultural and Human Resource Committee, Diamond Bar Bingo Boosters, the local Boy Scouts and A.Y.S.O. and Little League, the Walnut Sheriff Department, and the Walnut Unified School District. Patients agree that Dr. Lee has an energy and drive for his work, family, and friends like no other. 
Dr. Jong Lee raised two sons and a daughter with his wife in Diamond Bar. His children grew up to see their father’s love and dedication for his work and followed in his footsteps to become dentists as well. He is now practicing in the Lees’ Downtown Los Angeles office. He takes pride and joy in making the commute to serve the patients in the area. Dr. Lee’s professional affiliations include the American Dental Association (A.D.A.), California Dental Association (C.D.A.), Tri-County Dental Society, and the USC Alumni Association.

Dr. Jong Lee enjoys spending time with his family, golfing, traveling, and getting involved with his church. He definitely knows how to make his patients feel comfortable and safe—his humorous and generous nature is truly one-of-a-kind.
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