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6/ now I think studies seem to come out saying that flossing is useless. I have similar suspicions about brushing teeth 2x / day. Non of the dentists I asked could tell me why it's 2x/day and not 1x/day or 3x/day. They were just transmitting the dogma they were taught
IIRC 1x a day is sufficient (what you're really shooting for is 2mins of correct force and technique to loosen the biofilm), but apparently, most people don't use correct technique, so 2x is a safeguard. Can find the source if wanted
