Three dental students descend into an abandoned mine beneath the city and find a legend, a warning, and something in the dark that seems to know their names.
After the last lecture on periodontal disease, Maja, Kuba, and Artur did the one thing nobody expected from third-year dental students: they skipped the library, packed their bags, and headed for the abandoned mine beneath the city. Locals still called it Fluoride Cave, half in jest and half in fear.
The legend was ridiculous until it wasn’t. Deep underground, people said, there were crystals that could make enamel gleam as if it had been polished from the inside. And if the crystals were real, so were the warnings: tooth ghosts, pale things in the dark that came for anyone careless enough to neglect a brush, a check-up, or a guilty secret about their own teeth.
They entered with head torches, sonic toothbrushes, and a handful of energy bars, the air turning cold almost at once. The tunnel walls shone with a wet, chalky film that looked uncomfortably like plaque. The smell drifting through the mine was sharp and mint-clean, too clean to belong underground. Maja stopped beside a ledge of stone where someone had scratched a message into the rock: For two minutes, and no less. Follow the rules, and you may leave intact.
Kuba gave a thin laugh and dug a tube of fluoride toothpaste from his backpack, trying to make a joke of it. Artur didn’t laugh. His phone had gone dead a second ago, and so had Maja’s. Then, farther ahead, something moved in the blackness with a dry, deliberate flicker, followed by a sound like brushing in the wrong direction. Before any of them could speak, a voice slid out of the side tunnel, low and close and far too calm:
"Spit it out if you want to survive..."