Feynman didn't say you shouldn't brush your teeth, or that he doesn't brush his teeth. He said that brushing your teeth without ever looking at the evidence tha

Feynman didn't say you shouldn't brush your teeth, or that he doesn't brush his teeth. He said that brushing your teeth without ever looking at the evidence that brushing actually works is silly. Murray Gell-Mann claimed that he said that, but he seemed to have a chip on his shoulder wrt Feynman; and it looks like a jealousy thing. Feynman was right, too. His point was that people really do follow the herd too much - and he's 10,000% correct. It's good to know why you do things, especially when you do them two or three times a day for your entire life. Also, it's good to get to the root of the issue. People who don't eat industrial grain based diets have better teeth than we do, without every having met a toothbrush in their lives.