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Meet The Doctors

Dr. George E. Sas

York Hill Endodontics was founded in 1965 by Dr. Jerry Smith. In 1981, George Sas joined him in the practice and it is now the longest established endodontic specialty practice in Canada.

After graduating from dental school, Dr. Sas attended the Forsyth Institute (affiliated with Harvard School of Dental Medicine) in Boston where he completed a general residency program. In 1981, he completed his post graduate training in endodontology under Dr. Samuel Seltzer at Temple University in Philadelphia.

Dr. Sas has lectured in both South and North America and is fluent in Spanish. For more than ten years he was a clinical instructor at the University of Toronto’s Faculty of Dentistry. He has practiced for over 30 years and maintains a private practice in endodontics with his son, Geoffrey, a board certified endodontist.

Dr. Sas is an active member in good standing of the American Association of Endodontists, the Ontario Society of Endodontists as well as both the Ontario Dental Association and Canadian Dental Associations.

Dr. Sas lives in Toronto with his wife, Lesley. They have four children. In his spare time Dr. Sas is an avid tennis player and is an active member of York Racquets Club in Toronto. In 2017 George and his son, Dr. Geoffrey Sas teamed up to win the York Racquets doubles tournament


Geoffrey L. Sas

BMSC (Hons) Dip. Endo FRCD(C) Dip. ABE

Dr. Geoffrey Sas started his education in Physiology at University of Western Ontario. He continued his studies in Dentistry where he obtained his DDS at the University of Toronto and his AEGD Certificate at the University of California, Los Angeles. After discovering his passion in Endodontics, he completed his certificate in Endodontics at Nova Southeastern University. He has several publications in the areas of the endo-restorative interface. He has lectured nationally and internationally and he’s currently on faculty at the University of Toronto. Additionally, he is on the executive of the Ontario Society of Endodontics, and the George Hare study club. In July of 2018 he proudly became a Diplomate of the American Board of Endodontics.

Published Articles

Sas G. “A Perspective on Dentistry in the Developing World”, Aorta: Alpha Omega Review of Toronto Alumni Chapter, Pi Chapter. 2009 October; 51 (2): 12-13.

Sas G. “Sharing Smiles Day”, Aorta: Alpha Omega Review of Toronto Alumni Chapter, Pi Chapter. 2010 July; 52 (1): 16-17.

B. Basrani, K. Roth, G. Sas, O. Peters, A. Kishen, “Torsional profiles of New and Used Revo-S Rotary Instruments: An In Vitro Study”, JOE. 2011 July; 37 (7): 989-992.

Sas G, Dagan M. “The Single Compromised Tooth – Where are we going?” Oral Health. 2015. January 49-51.

Sas G. “An Endodontic Restorative Update. “ Oral Health. 2015 May 38-41.

Sas G. “The Cracked Tooth: Diagnosis and Management”. Oral Health. 2016 May 64-68.


During the COIVD-19 Pandemic and as per ADA and Mass Department of Health and Safety, our office is closed until further notice to elective dental/endodontic care. During this time, we may be able to accommodate some urgent dental emergencies after a telephone interview. Our office manager and front desk is taking telephone calls and trying to triage patients with acute pain. For safety of our dental staff, patients are triaged for symptoms of COVID-19 prior to their arrival at our office. Please call the office at 416-781-5251 for more information about this protocol. Note: Office appointments may take longer to allow for a more rigorous protocol of disinfection of all surfaces between patients following the CDC and OSHA standards for our collective safety. At York Hill Endodontics, we are committed to the highest standards of safety during your care under our supervision. When you arrive to the office, you will be asked to wash your face and hands before filling out forms. If you feel sick or are under the weather, we ask you to stay home until your symptoms are fully resolved. We are unable to treat patients with signs and symptoms of a cold, coughing, fever, sneezing, and other manifestations of an upper respiratory tract infection until those symptoms are fully resolved. We appreciate your understanding during this pandemic and our vigilance to provide the safest possible care to our patients and staff.