There are many dentists on the Internet who say it is very expensive and there is no warranty. There are few positive ones. I hope you can introduce the existing technology, which is reliable, cheap and acceptable. According to my experience, Dr. Mo from the second outpatient department of stomatology in a hospital can still do it. Careful, skilled and trustworthy. Of course, big hospitals charge more than small clinics. Dr. Mo is not as expensive as more than 300 yuan for a director to pull out his teeth on the Internet. Just talk to him first.