What is an Endodontist?

An Endodontist is a dentist who has completed two years additional post-graduate training to specialize in treatment of root canals. An
Endodontist is licensed by the State as a specialist, and in addition, may become a Board Certified Diplomate by successfully passing a rigorous series of examinations.


Dr. David Rosenbaum


Dr. David Rosenbaum grew up in the Los Angeles area. He attended the University of California at Los Angeles, graduating with a degree in Economics. In 1982, he received his dental degree from Northwestern University.

Dr. Rosenbaum then served two years in the United States Public Health Service in a community clinic near Bakersfield, California. He also directed community outreach programs to underserved children in the area. Following his two years of service, he moved to the San Diego area to start a successful general practice in San Marcos, California.

Dr. Rosenbaum returned to Chicago in 1996 to begin a full-time residency program in Endodontics at Northwestern University, achieving a Masters of Science and a Specialty Certificate in Endodontics in 1998. Additionally, in 2007, Dr. Rosenbaum became a Diplomate in Endodontics, having passed additional examinations administered by the American Board of Endodontics , the certifying board in his field. Dr. Rosenbaum practiced Endodontics in the Chicagoland area for nine years before joining Dr. Richard Felt and establishing North Shore Endodontics in Northbrook, Illinois. Dr. Felt has since retired in May of 2014.

Dr. Rosenbaum is an active member of the dental community holding memberships in: American Dental Association , Illinois State Dental Society , Chicago Dental Society , Edgar D. Coolidge Endodontic Study Club and the American Association of Endodontists . He is a past President of the Illinois Association of Endodontists and a past President of the North Suburban Branch of the Chicago Dental Society.  Currently, Dr. Rosenbaum serves as a Director on the board of the Chicago Dental Society.  Dr. Rosenbaum has given presentations at the Chicago Dental Society Midwinter Meeting, at the American Association of Endodontists annual session and regular lectures to general dentists about new technologies in Endodontics.

Dr. Rosenbaum is married and the father of 4 children. He enjoys working out and reading science fiction and mystery novels. He is active in his local synagogue and is a member of the Men's Club. He enjoys singing in the Men's Club choir.

Dr. Carl Rex


Dr. Carl Rex was born and raised in the Chicagoland suburb of Medinah, Illinois. He obtained both his bachelor and dental degrees as part of the accelerated Pre-dental Scholars Program at Marquette University in 2018. His dental school accolades include graduating Magna Cum Laude, receiving the International College of Dentists Leadership Award, and being inducted into the Omicron Kappa Upsilon national dental honor society.

Following graduation, he completed a general practice residency at the San Francisco VA Medical Center before returning to Wisconsin to practice as a general dentist. He then completed his specialty endodontic training at the Saint Louis University Center for Advanced Dental Education where he obtained his endodontic certificate along with his Master’s degree in 2023. His master’s thesis topic was cone beam computed tomography (CBCT) 3D radiographic imaging.

He is a member of numerous professional organizations including: the American Dental Association, American Association of Endodontists, Illinois State Dental Society, and Chicago Dental Society. He is currently board eligible for the American Board of Endodontics.

Dr. Rex is an avid Chicago sports fan and lifelong Bears supporter despite spending nine years in Wisconsin. He enjoys anything outdoors and is technologically savvy to the point where he built his own computer following high school graduation. He is an avid foodie and enjoys spending his free time trying new restaurants.