It's very busy at the vet's: all sorts of animals have come to get their teeth cleaned. Bobby the Vet uses lots of different toothbrushes to get the job done. When all the animals have got clean teeth, Bobby finds a huge toothbrush - it's for an elephant. There's no sign of the elephant so Bobby the Vet sets off into town to find it. \n\nMeanwhile in the Science Lab, Professor Millie is busy inventing. The clever scientist has invented a machine that makes delicious jam tarts. After an important taste test, Professor Millie sets the machine to put more jam on the tarts, but things don't go quite to plan. Jam starts to splat out\nof the window of the Science Lab. It's very sticky, and the fire engine and the Biggleton bus both get stuck in the jam. The jam has caused a traffic jam! Bobby the Vet also gets stuck whilst he's out looking for the elephant. The elephant's toothbrush that Bobby's carrying gives Professor Millie a great idea - she uses the toothbrush to brush away the jam.