Yeah, you don't need a double blind study here... Just measure the plaque levels before and after usage. As long as the plaque reductions are comparable, as we

Yeah, you don't need a double blind study here... Just measure the plaque levels before and after usage. As long as the plaque reductions are comparable, as well as the absolute final values, you're golden. Looks like the savings is about 6 days over 5 years (http://xkcd.com/1205/ http://xkcd.com/1205/). At a cost of $900 that's not a bad return on investment.