2 ．Tooth Cleaning洁 齿

医生：你好，我是王医生。请坐，你的牙齿怎么啦？You ’ ve obviously been brushing regularly because you don ’ t have any cavitiesto gumproblems ． I would say，I only need to give you a scale and pol‐ish ．.Doctor：Since you last visited a dentist，we have a lot more advanced technolog ......