tooth-rounding hob

例句：

1. 1.The dentist uses a tooth-rounding hob to smooth the teeth of his patients.
   牙医使用一个牙齿磨光器来平滑他病人的牙齿。
2. 2.The patient was given a tooth-rounding hob for home use.
   病人被给予一个牙齿磨光器用于家庭使用。
3. 3.The dentist used a tooth-rounding hob to remove the tartar from the patient's teeth.
   牙医使用一个牙齿磨光器从病人的牙齿上去除牙垢。