On a gloomy Monday late afternoon, three friends - Lena, Igor and David - sat in an empty chemistry class. The school was glowing empty and rain was oozing from behind the windows. Lena stared at the screen of her laptop, on which a mysterious game found the day before on a forum was just loading: "Tooth Escape Room - for the brave only". - 'It's probably some stupid educational game about brushing teeth,' muttered Igor, but he didn't take his eyes off the monitor. - Let's try it, maybe it will at least be funny - said Lena, clicking 'START'. The screen glowed white and the world around them suddenly swirled. In a second, the school classroom disappeared and they found themselves... in the middle of a giant mouth! Giant teeth formed the walls of the corridors, remnants of candyfloss and popcorn hung from the ceiling like lianas. The air smelled sweet, but Igor also smelled a faint scent of decay. - Had we just... entered the game? - David looked around nervously. His voice echoed off the slippery walls. A hologram of a toothbrush floated down from the ceiling and began to speak: - Welcome to the Tooth Escape Room! To get out of here, you must solve five oral hygiene puzzles. If you fail... The hologram paused, and suddenly a moving patch of black smear appeared at their feet and began to slowly grow. Tension hung in the air. Lena looked at her friends. - 'We'd better hurry up. What could be the first puzzle? Suddenly a quiet whisper came from the depths of the 'tooth maze': - If you can't find the paste, forget about escaping.... Will they have time to discover what hides in the nooks and crannies of this unusual mouth before the black ooze catches up with them?