We go to Dr. Mauney for peds dentistry and his wife (and business partner) Dr. Clifton is an orthodontist. We saw her once on a checkup & she seemed very nice. I would recommend the practice in general, but not sure about orthodontics (yet!).
They are located in Timberlyne in Chapel Hill... across from Timberlyne Shopping Center on the Harris Teeter side where all the medical offices are.