I would recommend you try the NTU Health Center
for it is just on campus with good dentists from NTU Hospital. And it offers discount if you bring your student ID with you there.
However, medical services in dentistry is only available every TUE morning .
So if you can't wait for long, you can try NTUH-KK. It does offer medical services in dentistry from Mon-Fri morning/afternoon.
(registration code: 122101/122102 for the morning, and 222101 for the afternoon session)
And it is said that the dentist,Zu-Chuan Kuo(郭儒銓), who in charge of the afternoon session, specializes in prosthodontics and may fits your need:) !
Hope you get well soon!
Amy