3 ms·
> I'm not certain why you believe that you need to run double blind clinical trials on a tooth brush Double blind means that neither the researcher nor the sub
by tjic 13y ago
> I'm not certain why you believe that you need to run double blind clinical trials on a tooth brush
Double blind means that neither the researcher nor the subject knows which device the subject got.
I don't think that this is possible (he said, with some understatement) when comparing a standard toothbrush to a bristly mouth guard thing.
- dlss 13y agoYeah, 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.