I went to have my teeth cleaned ... just across from the Transportation Bureau ... I was only 24 years old ... Because I stayed up late, I had dental calculus ... I wanted to have it done in Hangzhou ... on 120, but later ... I didn't wash my teeth because I thought it would be bad after washing them ... After going back and forth to Zhoushan ... my sister said my teeth were too dark ... like a smoker .. Tooth cleaner ... there are many doctors there ... and it's more formal ... He washed it once for 80 yuan, which is a little sour ... but it doesn't matter ... It's really clean after washing ... but the teeth are getting bigger ... Pay attention to diet ... Don't smoke ... Stay up late ... Pay attention to oral hygiene.