My amateur opinion is in agreement with him. Dead things rot and stink- you carry them out to the dumpster. It was probably causing my mouth to stink. There were no abscesses, redness, inflammation, bleeding- it just seemed that it was no longer an integrated part of my body, and it wasn't functioning in harmony with it. Was creating an entry point for bacteria- when removed, my body was able to seal off the area and form a much needed barrier. I can't give you specific areas of health that improved other than say that if you had some stinking trash in your house, there would be improvements on many fronts when you took it out. This sounds a little "new age", but that's truly how it felt. What troubles me is that there would be an imbalance of rear teeth. My wisdom teeth were a big problem, and had to be dug out- they were barely protruding when all pulled. I don't know what percentage of people wind up being able to keep their wisdom teeth- if you are one of the few that don't suffer from them, it's a shame to yank them. But I still tend to agree with the idea of removing dead things from the body. Are there people out there that still have their wisdom teeth? Are they good to have? Are you happy you kept them?
I'm still not clear on this dead tooth situation- did this tooth recently emerge from your gums in this state? Or has it had some sort of cavity or infection?