I used ecodent a lot last year; very light (I repackaged in a little bottle I bought on this site), I think it leaves less residue in the woods FWIW, a little goes a long ways.
I'm in the camp with those that wouldn't consider brushing their teeth with the Dr. Bronners. I've heard that some people don't like it used in their house because it leaves a film on the sink (?).
The big issue for me is that I carried a small (repackaged) amount of Bronners last year and basically never used it, in town or out. I don't know if I'm a filthy beast or just "more in touch with nature", but I don't feel the need to wash my whole body in the outdoors. I use purell for my hands, and carry a couple of scentless wetwipe packets to optionally clean up before going into town. I know that others find Bronners as some sort of universal solvent (hey, someone must read the outside of the bottle), but it's something I might just drop entirely from my base weight.
If you can stand baking soda as a toothpaste, I know it has a number of other uses, it might be a great choice. FWIW one thing I did find myself mildly craving after weeks of ecodent was to brush with "real" toothpaste, partly just to get the floridation perhaps (that plus the aluminum foil keep the aliens from controlling my thoughts ...).