About Us

ohana dorctor guan

Dr. Guan grew up as a teenager in North York. He received his B.Sc. and M.Sc. in Pharmacology from the University of Toronto, and D.D.S from the University of Western Ontario in 2001. He worked in Vaughan, prior to setting up his own practice in Bowmanville in 2004. He believes in helping patients achieve beautiful smiles with gentle care. He regularly attends continuing education seminars to stay current with new technology and techniques in the dental field. He is a member of the Ontario Dental Association, York Region Dental Society and has been an active member of the International Association of Orthodontics since 2003.

Dr. Guan enjoys family life, especially spending time with his two boys. He is also an avid photographer and received his professional photography certificate from the New York Institute of Photography.

Cristina of Ohana Dental


Cristina is our Dental Hygienist. She completed her Dental Assisting certification in Winnipeg, Manitoba and later moved to Toronto, Ontario to further her education becoming a Dental Hygienist graduating from Toronto College of Dental Hygiene with honors. She is both friendly and knowledgable and happy to answer all of your questions and concerns. Cristina recently moved to Courtice, Ontario and in her spare time enjoys working out at the gym and cooking!






donna at ohana dentalWhen you want to flash those pearly whites and face the world with a smile, come visit Donna, our professional hygienist for a while!…

Donna is a long term resident of Bowmanville with over 20 years of experience in her field. She received her credentials from Durham College (R.D.H.) and Trent University (B.Sc.) and has practiced both in Canada and the United States. As a friendly, understanding, skilled and knowledgeable member of our office, Donna enjoys working with patients of all ages. She is committed to providing comprehensive oral care to her clients and is up to date on the latest innovations in the industry.

When Donna is away from the office, she likes to spend time with family and friends. She enjoys travelling and the outdoors.

nimala ohana dental

Nirmala is our office manager who has been with the practice since opening in 2004. She graduated from George Brown College as a dental assistant and has over 15 years of dental experience. She has been working with Dr. Guan for the last 11 years. She is very knowledgeable and happy to help you co-ordinate your treatment and dental insurance.

She enjoys spending time with her family and friends, trying new restaurants and catching a movie.



shawna ohana dentalShawna is our office assistant. As a level II dental assistant, she helps create a great experience for you and your family. As a mother, she loves interacting with children to make their visit comfortable and fun.

When not working, Shawna enjoys spending time with her daughter doing various activities, among their favourites, fishing, soccer, skating and movies.



mistyMisty-Dawn is our office assistant. She is a new member of our dental team. She enjoys interacting with patients. Misty-Dawn looks forward to the variety of dental procedure in each day!

When Misty is not working she enjoys spending time with her family and friends.