Yang, Li DDS/DMDAttending and Clinical InstructorOrthodontics Orthodontics Education: McGill University Faculty of MedicineMain Office:978-341-8586 Heart Orthodontics 1732 Main St #C1A Concord, MA 01742 Clinic Intersts:orthodontics and dentofacial orthopedics.Office Hours: Monday 9:00 am - 5:00 pm Tuesday 9:00 am - 5:00 pm Wednesday 9:00 am - 5:00 pm Thursday 9:00 am - 5:00 pm Friday Closed Saturday Closed Sunday Closed