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A comment on Federal health expert drop flossing from health guidelines. Parent comment

Re:Federal health expert drop flossing from health guidelines by skolos on Wednesday August 03, 2016 @09:44AM (#12217827)
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.
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Re:Federal health expert drop flossing from health guidelines by bzbarsky on Wednesday August 03, 2016 @10:26AM (#12218106)
> A => B does not mean !B => !A.

Uh... yes, it does. See https://en.wikipedia.org/wiki/Contraposition

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Re:Federal health expert drop flossing from health guidelines by alejohausner on Wednesday August 03, 2016 @10:14AM (#12218016)
Sorry to be pedantic but A => B is equivalent to !B => !A . Still, I agree that US dentists overemphasize flossing.
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