About : Hart Orthodontics Your Smile. Your Confidence. OUR PASSION! When youre ready to transform your smiles beauty and health with top-notch orthodontic treatment, theres no better doctor in the Johnson County area to guide you through the process than Dr. Hart. With over 40 years of experience and over 10,000 bright and beautiful smiles, Dr. Hart has been providing patients with the highest-quality of care for decades. His practice features a wide variety of treatment options for all ages and at an affordable price to fit your budget. Dr. Hart and his wonderful staff looks forward to welcoming you in for a complimentary consultation and helping you achieve the results that last a lifetime.