What Sets Us Apart

Creating a Lifetime of Beautiful Smiles

Healthy, straight teeth and a radiant smile transform your life. When you know your smile is at its best, you’re confident around others: talking, laughing, and smiling with ease. Your smile opens doors, improves your oral health, and makes a lasting change in all parts of your life!

Every day, Dr. Donald Cassidy and the Cassidy Orthodontics team see the difference a new smile makes for people. We watch patients move from being self-conscious and unsure to having strong self-esteem and feeling comfortable with themselves.

We’d like to help you develop a lifetime of beautiful, confidence-filled smiles. With an individual treatment plan, advanced technology and techniques, and an eye on aesthetic concerns, we’ll soon have you loving your smile!

Exceptional Treatments

Our treatment options include mini metal brackets, clear brackets, and Invisalign® treatment. Over the years, we have seen huge improvements in all our treatments with temperature-sensitive wires reducing the discomfort of traditional treatment. As an early adopter of Invisalign technology, we have the most experience with clear aligner treatment in the area! This experience allows us to treat cases to an excellent finish that would have needed braces in the past. Invisalign now an option to treat at least 75% of our patients!


We know the best orthodontic experience, strongest results, and happiest patients all start with open communication. At your complimentary consultation, we’ll ask about your life, goals, and concerns. The better we understand your desires, the better Dr. Cassidy can tailor your treatment plan.

We’ll review the plan with you, and explain what’s happening in your mouth, Dr. Cassidy’s recommendations, and what to expect. We’ll also talk about options, financing, and your responsibilities. It’s essential that you have the information needed to make an educated decision about your future smile!

Throughout treatment, we’ll keep you updated. Parents are welcome in the treatment area, so you can see what we’re doing and ask questions.


We want you to understand your oral health and how it affects your body. By the time you finish treatment, you’ll have the tools and knowledge you need to keep your finished smile healthy and beautiful!

Our commitment to education includes Dr. Cassidy and our team members. We take many continuing education classes to stay current on developments in the field. Each of our assistants is certified by the Dental Assisting National Board as a certified orthodontic assistant!

Patient-Centered Care

You are important to each of us. We want to get to know you as a person and build a relationship with you. You’ll always be warmly greeted by name, and we’ll look forward to hearing what’s happened in your life since your last visit. Don’t forget to indulge in a fresh cookie and warm drink in the waiting room!

Schedule a Complimentary Consultation

Call and schedule a consultation at our Presque Isle or Houlton, ME orthodontic office today. Dr. Cassidy and our team can’t wait to meet you and get started on your confidence-filled new smile!