floss.

it takes about just as long, you generally need to be away from people to do it, and it completely occupies your attention. it also is ideal after meals.

i fell out of the habit after a while but when i was doing it every day (and sometimes twice a day), my dental appointments were a cakewalk and the hygienist would affirm me as a good boy with healthy gums.

like talking daily walks, eating lots of fiber, and stretching, it seems like the kind of habit that pays dividends when you're older and everybody else your age is all fucked up and looks 15 years older than you.