Hillside Orthodontics was founded on a simple belief: orthodontic care should feel as good as the results.
We're based in Fayetteville, Arkansas — and we're proud of it. Northwest Arkansas is one of the most dynamic, creative, and naturally beautiful places in the country. We built Hillside here on purpose.
Dr. Ryan O'Sullivan is an orthodontist with over a decade of experience helping patients of all ages achieve healthy, confident smiles. He earned his undergraduate degree from the University of Notre Dame before completing his dental education and orthodontic residency at the University of Oklahoma, where he earned both his DDS and MS degrees.
Dr. O'Sullivan offers a full range of orthodontic care, including Damon braces, clear aligners, and early interceptive treatment for younger patients. His approach is simple: meet patients where they are, and help them achieve the smile they've always wanted. He believes in honest, transparent care — recommending only what's truly needed and never overselling treatment. The result is an office where patients feel heard, respected, and genuinely at ease.
When he's not in the office, Dr. O'Sullivan can usually be found outdoors — mountain biking, hiking, or camping with his family. He and his wife Dr. Senushi O'Sullivan, a physician at Washington Regional Medical Center, are proud parents of two children, Sienna and Rhys.
Dr. O'Sullivan looks forward to welcoming you and your family and helping you put your best smile forward.
