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A => B does not mean !B => !A. In US (culturally): "Good dental hygiene" => "You floss". So dentists looking in your mouth can guess if you floss. However in Eu
by skolos 10y ago
A => B does not mean !B => !A.
In US (culturally): "Good dental hygiene" => "You floss".
So dentists looking in your mouth can guess if you floss. However in Europe flossing is not as common and the link breaks. All dentists can say is if you take good care of your mouth, not if you floss or not.
- alejohausner 10y agoSorry to be pedantic but A => B is equivalent to !B => !A . Still, I agree that US dentists overemphasize flossing.
- bzbarsky 10y ago> A => B does not mean !B => !A. Uh... yes, it does. See https://en.wikipedia.org/wiki/Contraposition https://en.wikipedia.org/wiki/Contraposition