School had always seemed like a predictable place to Cuba - until that night. The 17-year-old boy, fascinated by urban exploration, decided to slip into the old school dental clinic. Rumour had it that forgotten corridors stretched beneath the building, where no one had been for decades. He had with him a torch, a notebook and nerves tighter than an archer's bow. The door to the clinic opened with a quiet creak. Cuba walked through familiar rooms: a waiting room with faded posters about tooth decay, a surgery with an old dentist's chair and shelves full of expired toothpaste. Eventually he reached a cluttered storage room. Among the boxes, he found a grate in the floor - exactly as Tom from his class had described, although no one believed him. He lifted the grate, and a chill hit him in the face. Quickly grabbing his phone and backpack, he walked down the narrow metal stairs. When he descended, he found himself in a wide tunnel, lit by old bulbs on wires. The walls were decorated with bizarre mosaics - teeth in various shapes, some perfectly white, others all the way black, with drawings of toothbrushes, dental floss and dental instruments etched into them. He had to admit that it was a bit creepy, but also fascinating. Cuba was writing down every detail. Far ahead of him, the situation was getting weirder and weirder. For a moment, it seemed to him that there was a rhythmic scrubbing and jaws reminiscent of the sound of tooth brushing coming from one of the corridors. Cuba moved towards the noise. The corridor branched off, leading into a huge hall. At its centre stood several figures - strangely familiar and yet different. They looked like... giant, moving toothbrushes and tubes of toothpaste, dressed in work overalls. One of them held a banner that read: "Never underestimate tooth decay". Cuba felt his heart speed up. Suddenly, another silhouette emerged from the darkness - this time a shiny, silvery dentist with a laser-like tool. He turned directly to Kuba: - You are here for the first time. The question is, are you ready to join the Night Patrol? Before Cuba had time to answer, there was a terrifying bang like a thousand cracking teeth, and the light in the tunnel began to pulsate....