牙镜

例句：

1. 1. He used the dental mirror to check his teeth before the dentist.
   他在牙医之前用牙科镜子检查了他的牙齿。
2. 2. The dentist gave her a small dental mirror to help her clean her teeth.
   牙医给了她一个小的牙科镜子来帮助她清洁她的牙齿。
3. 3. She was using the dental mirror to polish her front teeth when she heard someone calling her name.
   当她听到有人叫她的名字时，她正在用牙科镜子抛光她的前牙。