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Our Doctors

Dr. Der

Dr. Der

Born in a small village in southern China, Dr. Der moved to Canada at the age of seven, living with his grandfather in an equally small Métis village in Northern Saskatchewan. He later attended high school in Timmins, ON before moving to Toronto for university. A 1975 graduate of the University of Toronto’s Faculty of Dentistry, Dr. Der worked as an associate in various practices, and in his spare time, volunteered with abandoned children in Costa Rica. He opened his own practice in 1982.

Dr. Der is co-founder and dental manager of Willowdale Dental Group. Dr. HD brings over 30 years of experience to our patients.

Married to Lizzie, he has two adult children, Jeff and Jasmine. In his spare time, Dr. Der enjoys poker and writing. He is currently working on a memoir.

Dr. David Chan

Dr. Chan

Dr. Chan completed 2 years of undergraduate studies prior to early acceptance into dental school. He graduated the Doctor of Dental Surgery program, with honours, at the University of Toronto in 2002. After graduation, David enhanced his dental skills by completing an Advanced Education in General Dentistry postdoctoral residency at the University of Texas Dental Branch in Houston, Texas.

Dr. Chan has a passion for lifelong learning. He has taken numerous advanced and modern dental education programs. These include courses / certifications ranging in cosmetic dentistry, oral sedation, oral surgery and implant restorations. He has experience working both in Texas and Toronto in private practice.

Dr. Chan will work closely with all of the dedicated Willowdale Dental Group team members / dentists to deliver the highest level of comprehensive dental care. He is available through email and or a in person meeting at our office. Dr. Chan is attentive to his patients' concerns and enjoys helping them achieve the healthy smile they have always wanted via his conservative and gentle approach to dentistry.

Dr. Nixon


Dr. Dale Nixon holds an BSc in Bachelor of Science and DDS from the University of Alberta. After graduating from dental school in 1977, Dr. Nixon worked as an associate in dental practices in British Columbia, Sydney (Australia) and the GTA before joining Willowdale Dental Group. Dr. DN also is an MBA graduate with an interest in understanding behaviour and personalities.

Dr. Dale Nixon enjoys all aspects of dentistry with a special interest in comprehensive dental care. Dr. DN, prefers to have built rapport with patients prior to initiating on any course of treatment. Dr. DN is available through email and or a in person meeting at our office. Dr. DN will take a number of before and after photos to ensure each patients case is well documented and the results are consistent with what was promised.

Dr. Ross Tam

Dr. Ross Tam

Dr. Tam has an undergraduate degree and an interest in research related Molecular Genetics/Biology. In 2003-2007, he completed his degree of Doctor of Dental Surgery at University of Toronto.

At Willowdale dental group, Dr. Tam emphasizes his practice to implant placement, cosmetic dentistry, restorative dentistry, oral surgery and orthodontics. At Willowdale dental group, Dr. Tam works closely with Dr. Ha, Nixon and Der to ensure patients receive comprehensive objective treatment planning.

Dr. Tam is certified to administer oral moderate sedation and is a big proponent of the practice motto of creating concepts in cosmetic and sedation dentistry.

Dr. Tam is part of an internal study club within the practice. He welcomes patients to come and meet with him prior to embarking upon in depth treatments. Dr. Tam's friendly demeanor make him an invaluable team member.

Dr. Katalin Dencs

Dr. Katalin Dencs

Dr. Dencs obtained her diploma from the University of medicine in Europe, Hungary as a general dental practitioner. Before becoming registered with the RCDSO in 1992, she practiced in Europe for years.

Dr. Dencs enjoys all facets of dental medicine with special interest in restorative, cosmetic dentistry and orthodontics. She participates regularly in continuing education to remain current in the profession. Her commitment is to apply her dental knowledge and skills in a caring and gentle way and provide the very best in dental health care for patient of all ages.

In her spare time Dr. Dencs enjoys reading, travelling, spending time with friends and family - especially her lovely grandchildren: Julian and Ava.

Dr. S. Peter Yune

Dr. S. Peter Yune

Dr. S. Peter Yune completed his Doctor of Dental Surgery degree at the University of Western Ontario in 1985. He’s had the pleasure of owning and operating a family dental practice in Burlington, ON, since 1985. Extensive experience with oral surgeries, dental implants, periodontal surgery, non-metal fillings, non-metal crowns and other intricate dental work has allowed Dr. Yune to make a lasting difference in the lives of his many patients. In [insert year], Dr. Yune spent four weeks as a volunteer dentist in remote villages in Honduras and Ecuador. This rewarding experience reinforced his dedication, commitment and overall passion for dentistry as a profession.

When not providing his patients with exemplary dental care, Dr. Yune enjoys spending time with his wife and three children, practicing hot yoga, playing tennis, traveling to spiritual places and maintaining a holistic lifestyle. He’s also a champion golfer and is very proud of his 4 hole-in-ones!

Dr. David Okamura

Dr. David Okamura

Dr. David, the middle of 5 children, was born to Japanese immigrant parents, in Alberta. He went to Port Credit High School and then obtained his BA in Math at Andrews University in Michigan USA. He graduated with his D.D.S. from the University of Toronto in 1969. In 1982 he married Ghislaine and the following year the first of their 4 sons was born. Kori, Riki, Kasey and Kyli are now all grown up and between the ages of 24-31.

One of his greatest enjoyments in practicing dentistry is to be able to engage in conversation with patients at a personal level.

Dave's interests include sports, casual golfing, philosophy, religion, arts, traveling and spending time with Ghislaine and the family.

Dr. Bill Kim

Dr. Bill Kim

Dr. Bill Kim received his dental degree from McGill University in Montreal, Canada where he received the Oral B Laboratories Dental Undergraduate Scholarship for outstanding academic achievement. He then pursued a General Practice Residency training at the New York Presbyterian Hospital, Weill Cornell Medical College, where he gained additional skills in dental emergency management, wisdom teeth extractions and dental implants.

After 4 years of practice Dr. Kim pursued advanced post-graduate education in dental anesthesiology in New York. Dr. Kim successfully completed a 2-year residency training in the anesthesiology department at Wyckoff Heights Medical Center where he learned anesthesia techniques for all types of surgery, including general surgery, orthopedics, podiatry, gynecology, neurosurgery, vascular and dental cases, for both inpatient and outpatient settings. Dr. Kim can provide sedation and general anesthesia to phobic, pediatric, and special needs patients, catering to their specific treatment needs.

Dr. Kim has also completed multiple advanced continuing education courses in dental implants, oral surgery and root canal treatment. He served as a part-time clinical instructor at the dental school of the University of British Columbia. In addition to his Bachelor's degree in Biochemistry, Dr. Kim holds a Master's Degree in Pharmacology where he investigated the role of genetics and metabolism in smoking behavior and received multiple awards and fellowships for this project which was published in 2005. During his anesthesiology training, Dr. Kim also published his sedation method in Anesthesia Progress (2015), the main journal for American Dental Society of Anesthesiologists.

Dr. Kim is an active member of the Canadian Dental Association, American Dental Association, New York State Dental Association, Ontario Dental Association and American Society of Dental Anesthesiologists. Dr. Kim is also be affiliated with College of Dental Surgeons of British Columbia, British Columbia Dental Association and Royal College of Dental Surgeons of Ontario.

In his spare time, Dr. Kim enjoys tennis, traveling and spending time with his family. He is also a seasoned piano performer. He speaks English, Korean and conversational French and Japanese.

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12 Finch Ave. West
Toronto, ON, M2N 6L1