Our Oral Surgeons


Dr. Rennie Cheung DMD, MD

Oral Surgeon

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.


Dr. James Habashy DMD, MD

Oral Surgeon

Dr. James Habashy DMD, MD attended USC for over 8 years where he obtained his BS in Gerontology, as well as his DDS degree. After graduating from the USC School of Dentisty, Dr. Habashy began an intensive residency in Oral and Maxillofacial surgery at the Harbor UCLA Medical Center. Since completing his residency in 2014, he has been the attending Physician in the oral and maxillofacial surgery division at the Harbor UCLA Medical Center. Dr. Habashy has built an impressive number of certifications and awards, including being the 2013 resident of the year in the division of Oral and Maxillofacial Surgery.


Dr. John Costandi DDS, MD

Oral Surgeon

Dr. John Costandi is a Board Certified Oral and Maxillofacial Surgeon. He graduated from Boston University School of Dental Medicine, where he was nominated and inducted into the BU Chapter of OKU Honor Society. He then completed his Oral and Maxillofacial Surgery training at Columbia University/New York Presbyterian Hospital in NYC. During his time at Columbia University, he earned his medical degree from Columbia University College of Physicians and Surgeons, completed a one-year internship in General Surgery, and served as Chief Resident during his last year of training. He received the interdepartmental resident of the month award for his compassionate nature and exemplary patient care. 


Upon completion of his surgical training, he joined Weill Cornell Medical College as an Assistant Professor of Surgery in the Division of Oral and Maxillofacial Surgery. During this time he trained and mentored future Oral and Maxillofacial Surgeons in full scope oral and maxillofacial surgery. 


After spending a year at Weill Cornell, he relocated with his family to Southern California. He currently serves as Assistant Professor of Surgery in the Division of Oral and Maxillofacial Surgery at USC School of Dentistry, where he continues to teach predoctoral dental students and oral and maxillofacial residents. In addition to his prestigious position at the dental school, he maintains a career in private practice at  multiple locations in Southern California, providing the highest quality of care.


Dr. Costandi has been published in peer-reviewed journal articles, abstracts and book chapters. He has particular interest in bone grafting, implant surgery, and extraction of impacted teeth. He is an active member of the American Association of Oral and Maxillofacial Surgeons, American Dental Association, International Team for Implantology and Academy of Osseointegration.


In his free time, he enjoys trying new restaurants and watching sports. However, his happiest moments are spent with his wife and two children.


What Our Guests Are Saying...


What is an Oral Surgeon?

Oral surgeons are amongst the most highly trained of all dental specialists. However, they are far more than just a dentist as oral surgeons focus on the entire maxillofacial region.

These specialists focus on the diagnosis and surgical treatment of a wide range of problems affecting the teeth, jaws, mouth and face. In this way, oral surgery can be used to improve both the function and appearance of the mouth and face.

oral surgeon performing surgery

Book Your Appointment Today

At Barsoum Dental, we proudly treat patients from all walks of life. We work with most PPO insurance plans for our oral surgery services and happily accept cash, checks and credit cards from patients without dental insurance. Since our patients come first, our on-staff oral surgeons perform same-day emergency procedures on weekdays and weekends. Contact us today to learn more about what we can do to mitigate your nerve pain and give you the confidence to smile once again.

Important Notice to Our Upland Patients

As of February 1st, our office located on 9th Street will only be seeing Orthodontic and Oral Surgery appointments. All other Upland guests will be seen at our new 450 North Mountain location.