Meet our team

The friendly and professional staff of Upper Thornhill Dental Care consider your dental health their top priority and are dedicated to providing a pleasant and comfortable experience.

Dr. John Ro

Dr. John Ro, HBSc. DDS., graduated from the Shulich School of Dentistry at the University of Western Ontario with a double major undergraduate degree in Honours Actuarial Science and Statistics. Dr. Ro is an active member of the Ontario Dental Association, Academy of General Dentistry and the Toronto Academy of Cosmetic Dentistry.

Dr. Ro approaches dental care with gentle ease and with the upmost professionalism. He encourages patient feedback and input, and supports communication as an essential key to maintaining a life-long relationship with his patients and proper oral care. Your comfort and dental health are always Dr. Ro's number one priority.

Since graduating from dental school, Dr. Ro continues to expand his education and knowledge of the latest technologies and procedures in dentistry. He is trained and experienced in the following fields of dentistry:

  • Certified provider of Invisalign (clear braces)
  • Children's dentistry
  • Cosmetic dentistry
  • Dental occlusion
  • Dental treatment planning
  • Esthetic gum surgery
  • Full mouth reconstruction/rehabilitation
  • Laser dentistry
  • Implant dentistry
  • Oral sedation dentistry
  • Orthodontics/interceptive orthodontics
  • Restorative dentistry
  • Rotary endodontics (root canal treatment)
  • Snoring and sleep apnea treatment

When he's not in the office, Dr. Ro likes to travel, golf, snowboard and spend quality time with family and friends.

Dr. Peter Valjas

Dr. Peter Valjas, DDS., FADI., has devoted his career to helping patients maintain oral health, giving them the opportunity to live a more confident, happier, and healthier lifestyle. He received his Doctor of Dental Surgery at the University of Toronto in 1982. He then completed his internship at Toronto Western Hospital the following year. For the next 11 years he worked with the osseointegration unit at Toronto General Hospital performing implant prosthetic work. During this time he began surgically placing implants and was involved in human clinical trials at the University of Toronto. Additionally, Dr. Valjas has lectured for surgical placement and prosthetic restorations of implants for both general dentists and specialists for Innova Lifesciences Corporation.

Dr. Valjas likes to spend time with his wife, Marianne, and children, Kristina, Len, and Austin. His hobbies and interests include cycling, cross country skiing, alpine skiing, snowboarding and fishing.

Dr. Donato Viggiani

Dr. Donato “Donny” Viggiani, DDS, HBHSc, was born and raised in Vaughan, Ontario. Dr. Viggiani obtained a Bachelor of Health Science from the University of Western Ontario in 2009. He completed his Doctor of Dental Surgery at Schulich School of Medicine and Dentistry at the University of Western Ontario. He has completed his National Dental Board Examination and is a member of the Ontario Dental Association and Canadian Dental Association.

Dr. Viggiani is the recipient of Academy of Operative Dentistry Award as well as the Toronto Crown and Bridge Award. Dr. Viggiani participated in multiple community outreach programs including a mission trip to Central America. He enjoys all aspects of dentistry and is enthusiastic to expand his knowledge with special interest in paediatric dentistry, endodontics, prosthodontics and restorative dentistry.

While not in the office, Dr. Viggiani enjoys playing hockey and golf and spending time with family and friends.

Dr. Linda Chau

Dr. Linda Chau, DMD, HBSc, completed her undergraduate degree at the University of Toronto before deciding to pursue her dental degree at the University of Sydney in Australia. She enjoys all aspects of dentistry and is committed to continuing education. Dr. Chau is an active member of the Ontario Dental Association and Canadian Dental Association.

Dr. Chau is a friendly dentist who is known for her gentle touch and caring chair-side manner; she strives to provide her patients with a comfortable and pleasant dental experience. She takes time to alleviate her patient’s fears and concerns, as well as thoroughly communicates procedures and treatment options.

Outside of dentistry, Dr. Chau enjoys reading, baking and spending time with her friends and family. She also loves travelling and trying different restaurants.

Dr. T. C. (Tom) Fok oral and maxillofacial surgeon

Dr T.C. (Tom) Fok joined Drs. Jokay and Fenton as an associate in 2014. He completed his oral and maxillofacial surgery training at the University of Western Ontario London, Ontario. He also obtained his Master of Science in Pathology from Western University. He is a Fellow of the Royal College of Dentists of Canada.

Dr. Matthew Chan periodontist

Dr. Matthew Chan, DDS, HBSc, MSc, PhD, FRCD(C), is the resident periodontist at Upper Thornhill Dental Care. A periodontist is a dentist who specializes in the prevention, diagnosis, and treatment of periodontal disease, and in the placement of dental implants. Periodontists are also experts in the treatment of oral inflammation. Periodontists receive extensive training in these areas, including three additional years of education beyond dental school. They are familiar with the latest techniques for diagnosing and treating periodontal disease, and are also trained in performing cosmetic periodontal procedures.

His clinical practice involves periodontal medicine as it relates to overall system health and regeneration of periodontal tissues including bone grafting and implant dentistry.Dr. Chan also helps organize and run dental mission trips in underserviced regions around the world. His dental mission work includes Amazons (Brazil), Chiapas (Mexico), and Tanzania (East Africa).

One of Dr. Chan’s passions is traveling and learning other cultures. His travels have brought him to places like Egypt, Jordan, Isreal, Palestine, Spain, Portugal, Italy, France, Poland, Brazil, and Mexico. If you are from an interesting part of the world that he hasn’t been to, please feel free to tell him about it so he can include it in his future travels.

Shirley MacGregor office manager

Shirley brings over 10 years of experience to Upper Thornhill Dental Care. As a dental business team leader, Shirley’s expertise in office management, accounts receivables, reception and dental assisting is uncompromising. Committed to quality customer service, Shirley is dedicated to ensuring our patients’ experience is a pleasant one.

Sharyn hygienist

I am so thankful to be part of a wonderful dental team who is strongly committed to providing every person who walks through the doors an opportunity to participate in their own dental care. Every day I’m here, I get to meet warm people who have become like family and friends. As a Dental Hygienist I enjoy being able to share my enthusiasm of cleaner teeth and healthier gums. I like being able to have conversations about your daily oral routines and be able to work, adapt, and introduce information and tools to be able to help each person maximize their oral and overall health.

I hope to be able to share and exchange stories and laughs while you’re in the chair with me and make it an enjoyable experience. In my past time I enjoy fishing, cooking, and travelling. Looking forward to sharing my time with you.

Rezvan (Rosa) hygienist

Rosa is a Registered Dental Hygienist who graduated from George Brown College with honors. She is a member of CDHO, CDHA and ODHA.She is mainly responsible for teeth cleaning, oral hygiene education, and detection of periodontal diseases and the prevention of all gum diseases.

She is well aware of client’s uniqueness and makes every effort to accommodate their individual needs. She loves working with children and seniors and has an exclusive caring approach that makes anxious patients feel at ease. Aside from work, she enjoys spending time with her husband and her children reading, swimming, hiking, cooking, baking and traveling.

Jessica dental assistant

Jessica joined our team in September of 2014 as a Dental assistant. Jessica brings over three years of experience to Upper Thornhill Dental Care. Since starting here, Jessica has enjoyed being involved withal new technology as they have developed and became available. She enjoys meeting new patients and the ones we have seen for years have become like family to her. Jessica clinical goals include client comfort and education. She believes that each patient deserves unique and individualized care that’s personalized for their specific needs and encourages opening discussions about any concerns.

Debbie office administrator

Debbie brings over 23 years of dental experience to Upper Thornhill Dental Care. I am presently working as a treatment coordinator, receptionist and assistant for Dr.Matthew Chan and Dr. Tommy Fok.

I’m so proud to be working for Dr. Ro and being a part of the A-Team. It is very rewarding. It gives me the desire and satisfaction to give all I can. The ability to help and interact with patients, gives me great joy in my work. I couldn’t ask for a better dentists to work with. When not at work, Debbie enjoys skating, traveling and spending time with family, friends.

Cinzia office administrator

Cinzia has over 20 years of experience in the dental field and is a vital member of theDental Team. Cinzia received a Diploma in Dental Assisting from the Toronto School of Business.

Cinzia is an expert at dental communications, and provides our patients with a wealth of knowledge for patients to access. She clearly explains to patients their dental health care benefits and treatment alternatives so they can decide on the best oral health care options suited for them.

Cinzia is a proud mother to her two daughters, Sara and Emily. Outside of the office, she enjoys playing soccer, travelling and baking.

Stephanie office administrator

Stephanie is a full time student at the University of Toronto and has been working as a part time dental receptionist for two years. She is completing an Honours BA in English literature and French linguistics, and has studied abroad. While not at work or in school, Stephanie enjoys playing soccer, travelling and spending down-time with friends and family.