I just started reading about Modiflan. I talked to them about their process, they have separate O2 supplies, etc. the whole deal. It's one of their specialties. They don't use any fluoride or mercury fillings in their practice, which is a good sign. They said they'll give me chlorella to swirl around in my mouth and I'm going to take a bunch before I go in. Having two small fillings replaced on Monday.
Not cheap though! Even with good insurance it's still going to cost me thousands of dollars to get this taken care of. Oh well, worth it in the long run.