I think it was corrected in 1999 or 2000. At that time, it was more than 4000, but now it's cheaper.

BTW, it is best to correct your teeth before 12 years old. It's not that you can't correct your teeth beyond 12, but you can change your face shape before 12, which is why many children feel beautiful after correcting their teeth. If you don't believe me, you can Baidu it. Most of the world-famous plastic surgeons were born in stomatology. At least they should know the basic knowledge of oral cavity!

I corrected it before. Some friends are studying this major, so I know a little, hehe.