1. The odontologist examined the patient's teeth and diagnosed a cavity that needed to be filled.
牙科学家检查了患者的牙齿，并诊断出需要填充的蛀牙。
2. My brother is studying to become an odontologist and hopes to open his own dental clinic in the future.
我弟弟正在学习成为一名牙科学家，并希望将来能开设自己的牙科诊所。