In terms of corrective technology, the top doctors in China are not so-called older professors, but doctors who graduated in the 1990s, aged around 40, and have a background of studying abroad. These doctors usually have their own private clinics, so your knowledge of stomatology in China is questionable.
In terms of materials, professional manufacturers of corrective materials such as 3M and Omco in the United States are better, but public hospitals are limited to charging fees and generally do not use imported materials.
The best orthodontics in the world should be said to be Switzerland, where people maintain their teeth well, dentists are facing unemployment, and they have to make money by orthodontics, so which country has more advantages in technology research and development. Of course, the United States is not bad now, and is trying to catch up.