I don't know which one in Jinan made a mistake, because I'm not from there and I've never been to Jinan! I am also a 25-year-old dentist. I have to wear it for three years. As for the fastest, it's hard to say, because this thing depends on my personal situation. If the price is cheap, it is 5000 yuan, but the good thing is that there are tens of thousands of dollars!