Dr. Tracy Li Cheung of Orthodontic Harmony is a forward-thinking, orthodontic expert who believes in clear communication, attention to detail, and progressive solutions. Juilliard/Stanford/UCSF trained Board Certified Orthodontist and Premier Invisalign and Invisalign Teen Provider, Dr. Tracy Li Cheung, provides progressive orthodontic ...About‧New Patients‧Appointments‧Services‧Our Smiles‧Contact.