牙科

例句：

1. 1. She needed to have her teeth cleaned before the surgery.
   她在手术前需要洗牙。
2. 2. The dentist advised her to avoid hard candy for a week.
   牙医建议她一周内避免吃硬糖。
3. 3. He was so nervous about the upcoming dental exam that he couldn't eat anything.
   他因为即将到来的牙科检查而紧张得连饭都吃不下。