I am not wearing dentures yet but it is inevitable to most of us. I can sympathize with your wife, I also take a lot of meds and notice a huge change in the past few years.
I watched a program on the telly a while back. Part of it told horror stories of people having dental work done in Mexico. I am sure that there are some good and bad dentists there, like anywhere. The program made a point of telling people to really have references from people you know before having any procedure done. These dentists seemed to take advantage of seniors, travellers mainly. I hope someone here can give you some positive info.