All our professionals at Johnstone Periodontics maintain the highest levels of accreditation and pursue ongoing education to stay abreast of the latest trends in periodontics.

Dr. Andrea Johnstone

BSc(Hons), DDS, MSc(Perio), FRCD(C)



Dr. Andrea Johnstone is a board certified periodontist who provides comprehensive periodontal care to patients including implant surgical procedures. Dr. Johnstone has a special interest in soft tissue grafting for teeth and implants and regenerative surgery. Dr. Johnstone completed her undergraduate degree in Biomedical Science from the University of Guelph. She then received her doctor of dental surgery degree from the University of Western Ontario. Dr Johnstone then completed a residency program at Mount Sinai Hospital in Toronto. Dr. Johnstone then received her Masters of Science (Periodontology) at the University of Toronto. Dr. Johnstone is a fellow of the Royal College of Dentists of Canada.  Dr Johnstone is a staff Clinician at the Centre for Advanced Dental Research at Mount Sinai Hospital in Toronto completing clinical research in advanced cases of periodontal disease, gingival recession and developing new techniques for papilla regeneration.   Dr Johnstone is also the Past President of the Toronto Central Dental Society, and Past President of the Ontario Society of Periodontists.  Dr Johnstone also enjoys cooking and golf and is a mother to twin boys!


Dr. Monica Raina


Dr. Monica Raina graduated with a Doctorate in Dental Surgery from the University of Western Ontario which led to a post-graduate certificate in a General Practice Residency at the University of Rochester, and finally a Masters of Science degree and Diploma of Periodontics at the University of Iowa. She is a dually board-certified Periodontist in Canada and the United States, as a Fellow of the Royal College of Dentists of Canada and a Diplomat of the American Board of Periodontology. Monica has also won multiple academic awards and published several scientific publications. 


Dr. Gabriella Garisto 

Dental Anaesthesiologist

Dr. Gabriella Garisto holds a Masters in Dental Anaesthesiology and is one of the few Dentists in our province who holds a Board Certified specialty status in this area of expertise. Dr. Garisto graduated from the University of Toronto Doctor of Dental Surgery program with Honours. She was inducted into the Omicron Kappa Upsilon National Dental Honour Society and has won awards and scholarships in the areas of pain control and patient management, as well as in preventive dentistry. Her subsequent three years of training in the Masters Dental Anaesthesia program included major rotations at the Hospital for Sick Children and the Toronto East General Hospital. When she's not at work, Gabriella enjoys cooking and travelling.                                                                                     

Registered Nurse:

Tina Kightley


Office Manager:

Amanda Termeulen


Business Coordinators:

Liz Moulis

Yasmine Folliott


Registered Dental Hygienists:

Teresa D'Onofrio

Elise Boyd


Dental Assistants, II:

Daniela Noguiera

Britten Miller

Julia Felizola