Many years. The most professional dentistry in Chongqing. One of my classmates also has very serious teeth, super serious. In winter, my lips can't wrap my teeth. Now I'm almost like a star on TV, without steel teeth. She is very serious. She spent thousands of dollars, decades of contract packages, and appraisal books. I don't think you are as serious as my classmate. Everyone's situation is different and the price is different.