I have been twice to Narayan Hrudyalaya and I found the clinic to be very nice.
I had undergone few teeth fillings and one RTC there and the staff was really courteous and dentists did a very good job. They had the required skills and expertise and they made sure that the patient gets the least pain.
Only, the negative thing about Narayan Hrudyalaya dental clinic is it is very expensive.
If money is not big concern then one can opt for Narayan Hrudyalaya.