This is awesome. I want more articles like this. I want to read an article like this every day until every trip to the pharmacy or grocery store makes me feel full of intimate and arcane knowledge, and every aspect of my life is 10% more fulfilling.

A followup question I'd be interested in: if I bought an electric toothbrush, I would (a) have trouble bringing it during travels (I am traveling maybe two months out of the year), and (b) when my roommates' electric brushes are plugged in, I often bump into them which I both dislike and am concerned about the effects on their cleanliness.

However, whatever the results in this case, I personally already have an extremely low rate of cavities (on the order of .05/year) and so am probably less interested in paying more for dental care than average; changes in habits should have orders of magnitude lower expected value for me. Which is to say that if nobody else cares about these questions, it's fine if they go unanswered.