tooth shape

例句：

1. 1. The dentist advised us to brush our teeth twice a day.
   牙医建议我们每天刷牙两次。
2. 2. The study found that the shape of the teeth had an impact on their functionality.
   研究发现，牙齿的形状对其功能有影响。
3. 3. The patient's tooth shape was unusual, requiring special care.
   患者的牙齿形状不寻常，需要特别照顾。