So now I am getting to a point where I want to close those spaces again. My new ortho is pushing me towards just replacing the teeth with bridges. The spaces are smaller now than they were, but they are still pretty big. Leaving the spaces open is not an option because I look like a hillbilly

The reason my ortho is pushing me towards bridges is that he said he can move my back teeth forward to fill in the gaps by using TADs (temporary anchorage devices), but he has never used this method before and doesn't want to make me a guinea pig because 1) I've been through so much crap already he doesn't want to put me through more than necessary and 2) He doesn't have any experience using TADs yet and doesn't want to try it for the first time when the gaps are so large. So what I'm wondering (and forgot to ask him ... I don't go back now until February so have to wait to ask him) - what other alternative methods are there to closing these gaps (i.e., to bringing the back teeth forward)? Obviously, since my ortho has been in practice for 20 some years he has moved back teeth forward on other people in the past, so there must be another way. I don't understand why we can't just use the "old" method rather than having to do the TADs.
Power chains? Would those work? Has anybody else had back teeth brought forward to close gaps? Any other ideas?