In the small, colourful town of Ząbkowo lived a girl called Ania. She had a friend, a boy called Max, and together they were always inventing amazing games. This time, however, someone special joined them - a dog called Fluorek, who had fur that looked like a toothbrush instead of his usual coat! One sunny afternoon, the children were playing in the garden when suddenly Fluorek started barking and wagging his tail. In the tooth bushes he found an old map on which strange tooth-shaped marks were drawn. On the map someone had written: "Here begins the trail to the great Smile Treasure!". Anne and Maks looked at each other in wonder. "Maybe it's a box full of candy?" laughed Ania, and Maks added: "Or toothbrushes that brush their own teeth!" Fluoride barked, as if to tell them to move on. The children and the dog followed the footsteps leading through the town. First they walked through a mint-scented forest, where every twig whispered: "Remember to brush your teeth!". Further on, they came across a bubbling bridge hovering over the Healthy Smile Brook. As they crossed the bridge, bubbles tickled their noses and made everyone laugh. Suddenly a huge, slippery Caramel Stone appeared in the road. It was so big that it was impossible to jump over. There were lots of sticky sugar stains on its surface. "It's probably unhealthy for your teeth..." muttered Maks. Fluoride jumped up and started brushing the stone with his unusual fur. The children took out their own toothbrushes, which they always carried in their backpacks after their nursery classes, and started to help the doggie. Together they brushed and brushed until suddenly something started to happen.... A small, shiny handle appeared in the middle of the Caramel Stone. Anna pressed it carefully. The stone trembled, and a passage to the grotto began to open in front of them.... What will the children and Fluorek see inside? Will they find the Smiling Treasure the map spoke of? Or is there something waiting for them there that they don't expect at all?