dentin exposure

例句：

1. 1.The patient's teeth were severely damaged due to the trauma.
   由于创伤，患者的牙齿严重受损。
2. 2.The dentist advised the patient to wear a night guard to prevent further damage to his teeth.
   牙医建议患者佩戴夜用保护器以防止牙齿进一步受损。
3. 3.The child was bitten by a dog, resulting in severe dentin exposure and needing immediate dental care.
   孩子被狗咬伤，导致严重的牙釉质暴露，需要立即的牙科护理。