Haha, which city should I ask? But generally there are about 5,000 children in second-tier cities. Around 8,000 for adults. There are about 6,000 children in first-tier cities! It costs about 10,000 for an adult. I estimate it would cost 20,000 in Beijing and Shanghai. Orthodontics costs only RMB 2,000 to 3,000 in some third-tier cities. The material cost of organizing this thing itself is not high. It is mainly the skills of doctors that are valuable. Because orthodontics involves many problems. It’s not just about straightening your teeth. Go to a formal place.