Difficult finding a good dentist that can do more than fix a small hole or pull teeth where I am located.  Anyone know of a good dentist in Hua Hin that can do serious tooth repair? Would be grateful for any information that would help. If not Hua Hin any other cities located not far from there.

Normally the bigger the clinic the better as get specialized treatment.  Believe most hospitals will have dental departments so that might be a good option.  I use such a facility here in Bangkok, where there is also a number of good large clinics available.  Expect whoever you now use could recommend someone to do the RCT.  Sorry have no knowledge of local facilities.