The window is not a date.

"Doc, how long has that been there?"

I have answered that question ten thousand times, and the honest answer is a shrug: hard to say, probably a while. It is defensible. It is also the strangest sentence in medicine, because the person saying it is the only clinician who was in the room while the answer was happening.

The Greeks kept two words for time. Chronos is the clock, the kind that passes whether or not you are watching. Kairos is the other kind: the stretch of time in which a thing can still be changed. Not a date. A state. The disease is there, and it is still yours to move.

In a body, kairos is the distance between when a disease begins and when it gets a name. That distance is usually long. For one of the diseases I care most about, the biology is measurably moving twenty-five years before anyone says the word. Most of that runway is quiet. All of it is negotiable. And almost none of it is where medicine looks, because medicine is built to look where the name is.

Picture a body. Now put the mouth back in it. We look at the mouth twice a year, for decades, with a light and a mirror and our hands. No other clinician gets that regular a look at a living person. That makes the dental chair the earliest seat in medicine, whether or not anyone told us. It sits at the front of the runway.

So the question turns around. Not "how long has that been there," past tense, but "what is starting," present tense, in the person in the chair right now. Same question. Different window.

Medicine has a word for how disease begins: pathogenesis. The whole apparatus is built to watch it, and it watches late. Medicine barely uses the word for how health begins: salutogenesis, Aaron Antonovsky's word from 1979. It is the same runway, read in the other direction. Kairos is where both get decided. I want the exam to watch both, and it can, if we read the direction of things rather than the number.

Next letter: three windows, one of which nobody taught us to look through.

What do you see?

Thad