In your mouth, trouble starts when stray food particles get trapped in your teeth, producing decay bacteria. These bacteria produce acids that eat away at your smile, turning Handsome Harry into an unlikable sloth. Meanwhile, Cutie Katie, having first tried a competing brand, found brushing to be a chore due to its bitter, medicine aftertaste. As a result, she has no idea her once fresh, minty breath now smells like a swamp.