@hiddenhuman.de: That brown line on a front tooth looks like a crack. It isn't — it's the outline of an old white filling. White fillings are slightly porous, and the seam where filling meets tooth is the most porous spot of all. Coffee, tea, red wine and dark sauces leave a little pigment there every day, until the edge shows up as a thin brown line. Often it's just stain. But a dark edge can also mean the seal between filling and tooth has started to open — and decay can grow underneath where you can't see it. A dentist can tell which one it is in a quick check. Have you got a white filling that's turning brown at the edges? Tell us in the comments and follow for more clues your mouth leaves. This footage is an AI visualisation · not medical advice. #teeth #fillings #dentalhealth #oralhygiene #coffeestains

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Tuesday 06 October 2026 04:30:08 GMT