Why do we stare at our own face while brushing our teeth?

The short answer It’s not vanity—it’s the one appointment you keep with your own face. Twice a day, for two fixed minutes, the hands are busy and the eyes are free, and you look at yourself the way you never otherwise would: steadily, at close range, with nothing to do but see. It’s the slow reveal of your own aging, delivered in installments small enough to bear. You aren’t grooming. You’re being shown, gently and daily, the one thing you’d never sit still long enough to look at head-on.

The longer answer

Twice a day you stand at the mirror with a brush in your mouth and do the strangest thing: you look, without flinching, at your own face, up close, for two full minutes. You’d never do it otherwise. Catch yourself staring into a mirror for two minutes with nothing in your hands and you’d think something was wrong. But give the hands a dull, automatic job—the brush going round, the mind not needed—and the eyes are suddenly freed, and they go, as eyes do, to the most interesting thing on offer, which is the face looking back.

And what they see, across the years, is the one film you’re never allowed to watch at normal speed: yourself, aging. Day to day it shows nothing—the face is the same face it was yesterday. But the mirror keeps its appointment every morning, and over a decade of those two-minute sittings it lets the change in, a frame at a time, so slowly you can bear it. The line that wasn’t there. The grey coming in at the temple. The face settling, gradually, into the one it’s going to be. You are watching yourself grow older, in the only dose a person could actually take: two minutes, and then you spit, and rinse, and get on with the day.

I don’t think this is vanity, though it’s easy to file there. Vanity wants the mirror to flatter, or to reassure. This is the opposite—the mirror telling the plain truth on a schedule, and you, brush in hand, made to look. It’s nearer a discipline than a weakness: a small daily rite of not looking away from your own mortality, performed under cover of dental hygiene so that you can survive it.

Because you couldn’t take it all at once. Shown your sixty-year-old face at thirty, you’d reel. Shown it a morning at a time, brush in mouth, kettle waiting, you simply absorb it, and are not destroyed, and are even—on the good days—reconciled. The busy hands are the mercy. They let the eyes do the hard looking while the rest of you is occupied with something it can succeed at.

Whether what you’re being shown is a loss or just a truth, I leave to you and your particular morning. But the mirror isn’t there for your looks. It’s there to keep you, gently, on nodding terms with the fact of your own passing. It may be so. It may not.