Curious to know why he needs to brush and floss his teeth twice a day, a boy visits the dentist. This issue of Marvellous Microbes is four-page booklet suitable for pupils from 9-13. A boy, curious to know why he needs to brush and floss his teeth twice a day, takes a trip to the dentist who introduces him to the plaque acid producing bacteria that live on our teeth. The comic includes an experiment to try at home looking at the function of fluoride toothpaste in our daily brushing routine.