The reason for this is the following：

Shenzhen is a first-tier city, attracting a large number of talents, including orthodontists. Orthodontic technology is also one of the best.

The other is the price. There are many dentists and dental factories in Shenzhen, and the cost is lower than that in Dongguan, which will be more affordable.

In addition, Shenzhen has a large population,13.4 million, and Dongguan has a population of more than 8.4 million. With a large population, there is a great demand for correction and many doctors' cases, so we can accumulate experience.

Source Baidu map