Our Oral Surgery

Our Chino, Chino Hills and Upland Oral Surgeons

Dr. James Sunwoo, MD, DDS

As an experienced maxillofacial and oral surgeon, James Sunwoo, MD, DDS  has been practicing dentistry in Southern California since 2009.

After receiving his undergraduate degree at the University of Chicago, Sunwoo moved to California where he went on to earn dual degrees in medicine and dentistry from the University of Southern California and Columbia University. After graduation, he began an intensive internship and residency at the USC. 

Sunwoo's impressive career has been marked with several honors and awards. Some of his most notable accomplishments are his work with the Institute of Systems Biology on molecular biotechnology. Dr. Sunwoo has become a pioneer in this field and continues to make great advances with his research team.

With such an impressive resume, Sunwoo is known for providing the highest quality of care for each and every patient he sees. When Dr. Sunwoo is not busy with surgery or medical research, he enjoys traveling, hiking and spending time with his family.



Dr. Rennie Cheung DMD, MD

One of the leading oral surgeons in Southern California, Dr. Rennie Cheung graduated from UCLA Medical School where he earned a medical degree in dental surgery. Dr. Cheung received the bulk of his medical training at the University of California in Los Angeles. He also completed an intensive fellowship at the American Academy of Cosmetic Surgery in Beverly Hills and is a member of the Oral Surgeons Society and SFV Oral Surgeon Society.

Dr. Cheung has an impressive list of licenses and memberships with some of the most respected professional dental organizations, such as the American Association of Oral and Maxillofacial Surgery, the California Association of Oral and Maxillofacial Surgery and the American Academy of Cosmetic Surgery. As a board certified oral surgeon with an expertise in oral and maxillofacial surgery, patients will receive the best care possible with Dr. Cheung.

When Dr. Cheung is not in surgery or taking care of patients, he spends his valuable spare time reading, skating, cycling or practicing Brazilian Jiu Jitsu.


  • M.D., 1997: University of California, Los Angeles
  • D.M.D., 1993: Tufts University School of Dental Medicine
  • B.S.C. Physiology, 1988: McGill University


  • American Association of Oral and Maxillofacial Surgery
  • California Association of Oral and Maxillofacial Surgery
  • American Academy of Cosmetic Surgery


  • California State Dental License
  • California State Medical License
  • General Anesthesia License
  • Board Certified in Oral and Maxillofacial Surgery


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Office Locations

  • Upland
  • 258 East 9th Street
  • Upland , CA
  • 91786
  • Map & Directions
  • Call: 909-920-5222