> The opportunity cost is low. You have nothing to lose by doing it, other than a couple bucks spent on floss.

I have ADHD. I hate flossing, and I'd put off flossing to the point where I wrecked my sleep cycle and tended to end up just not brushing my teeth before bed.

Ever since I stopped flossing, I've basically always brushed my teeth and have kept my sleep cycle more successfully.

Yes, I know this is potentially very bad dentally, but frankly I'm sick of having a catastrophically unreliable sleep cycle due to my mental illness and I'm willing to accept half-assing it if it means it doesn't destroy my life.

That said, I have no particular opinion on the evidentiary base of flossing - my dentist has always recommended I floss, and I believe his recommendation. I would floss if I could.