Copypasting my comment in !europe@feddit.org (it was cross posted there) :

To be fair, it’s a bunch of random personal experiences that in no way represent France as a whole. Fil dentaire has existed for decades here, people use them if they want to, in addition to brushing their teeth three times a day after each meal. The fact that the article translates it to soie dentaire which is exclusively French Canadian makes me very distrustful of the author…

Google Translate suggested “passer la soie dentaire”, which roughly translates to “passing dental silk between your teeth”.

What kind of journalist relies on google translate for a translation and not fact check…