I did it once, but it was not clean. I have to do it several times before it works. The price at that time was that a face was divided into five parts: forehead, left cheek, right cheek, nose and chin. 2900 yuan per part. You only need to pay once, and there will be no charge for doing it later. It seems to be called Venus spot absorption technology, and my face is very uncomfortable after using it for a week.