The town was asleep, but there was an ominous mist over the old dental clinic. Magda, a dental student, along with her two friends Adam and Jagoda, decided to go inside. The old clinic had been abandoned for a long time and there were eerie stories circulating about its interior. Everyone had heard about Professor F, who was supposed to be conducting experiments on 'perfect oral hygiene' here, and then unexpectedly disappeared. Magda lit a torch and looked at the faded educational posters. Among them, one caught her eye: "Let your toothbrush be your shield and floss be your sword!". They walked through the creaky corridor. Suddenly the torchlight reflected off something fluorescent. At the end of the corridor stood a row of white hooded robes, and in each hand gleamed a a huge toothbrush. There was a smell of peppermint toothpaste in the air. After a moment, one of the figures moved, heading straight towards them, whispering: "Only those who take care of their teeth can pass on...". Adam squeezed Jagoda's hand tighter, and Magda, trying to hide the tremor in her voice, took a step forward. But before she could say anything, a quiet giggle came from the dark corner and strange footsteps began to appear on the floor - as if someone had spilled sugar.... What awaits them behind the next door of the clinic and who are the mysterious Fluor Knights?