Meet Dr. Don Cassidy

“I feel privileged to have so many families trust us with their orthodontic care. We have the opportunity to get to know them and watch their growth over the years. I am very proud to see patients come back in full of confidence and know that we played a role in their lives.” – Dr. Cassidy

Education and Continuing Education

  • Fort Fairfield High School, 1980
  • Bachelor of Science – University of Notre Dame, 1984
  • Doctorate of Dental Medicine – Tufts University School of Dental Medicine, 1988
  • Master of Science – St. Louis University Department of Orthodontics, 1990

Dr. Cassidy regularly attends continuing education meetings in order to stay current on the quickly evolving landscape of orthodontics. He knows technology is changing our lives in many ways, and orthodontics is no different. Only five years ago, Invisalign® patients had to endure difficult impressions that took five minutes each and often needed to be redone. Now, with the use of the iTero® Digital Impression System, Dr. Cassidy is able to get an excellent 3D image comfortably in just a few minutes! He is passionate about streamlining treatment to help improve treatment outcomes and shortening treatment time.

Professional Memberships

  • American Dental Association
  • American Association of Orthodontists
  • Maine Dental Association
  • Northeast Society of Orthodontists, Board of Directors
  • Aroostook County Dental Society, Past President
  • Maine Association of Orthodontists, Past President

Giving Back

Dr. Cassidy has spent much of his career involved with organized dentistry at the local, state, and regional levels. He currently represents Maine on the Northeastern Society of Orthodontists, which includes New England, New York, New Brunswick, and Quebec.

Additionally, Dr. Cassidy has been a member of the Presque Isle Rotary Club for 20 years and recently received the Paul Harris Fellow award. He has also received the State of Maine “Dental Health Hero” award from the Maine Dental Access Coalition at the state house in Augusta. The award was for his work with a Head Start initiative to coordinate with the dental community to find dental homes for Head Start children. He also serves on the Foundation Board at the University of Maine at Presque Isle.

As a practice, Cassidy Orthodontics likes to give back to the community and especially help young people to have opportunities to see places and do things that they may not have the chance to otherwise.

Beyond the Practice

Originally from Fort Fairfield, Dr. Cassidy has called Presque Isle home for 29 years. His wife, Kathleen Ledger Cassidy, is a stained-glass artist: Stained Glass by KLC. The couple has two grown sons. Bennett currently attends Florida State University Law School and plans to return to Presque Isle after he graduates. Brock graduated from Bowdoin and is now a vice president at Rocket Homes and lives in New York City. Dr. Cassidy’s dog Beau loves to run the trails behind the house.

When they’re not working, Dr. Cassidy and Kathleen spent a lot of time at their camp at East Grand Lake: relaxing and doing some fishing. They also enjoy traveling and seeing new things, so they hit the road as often as they can.

Closer to home, Dr. Cassidy likes to golf at Aroostook Valley Country Club, hike, and hunt, and recently has become interested in carpentry while fixing up his home. He also has his private pilot’s license and loves flying over the area.