It should be more than 100 to 200. After all, regular hospital services are good, but you can't wash your teeth too much. If it's bad for your teeth, you can see if there is a good reputation on the group buying website. Generally speaking, you can't wash your teeth too often, just once every two years. It's best to go to a regular hospital to wash your teeth. Small places are not clean and easy to be infected with diseases such as hepatitis B and AIDS. You may feel more at ease after washing your teeth outside.