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gwern comments on Rational Toothpaste: A Case Study - Less Wrong
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No. I'd actually never heard of them before. I looked quickly at Wikipedia and one of the claims struck me as equivocal - it may be better at reducing bleeding than flossing, but it's only as good at the actual anti-plaque cleaning?
I just did a brief look at the easily accessible abstracts that I could find and got the impression:
Oral irrigator + electric brush > Oral irrigator + normal brush > flossing + electric brush > flossing + normal brush > normal brush.
I'm not sure to what degree publication bias applies.