cheilitis actinica

例句：

1. 1. He developed a severe case of cheilitis actinica.
   他患上了严重的牙周炎。
2. 2. The dentist advised him to visit the hospital for treatment.
   牙医建议他去医院治疗。
3. 3. Cheilitis actinica is a chronic condition that requires regular dental care.
   牙周炎是一种慢性疾病，需要定期的口腔护理。