Two billion people across the world are infected with parasitic worms. The World Health Organization recommends mass deworming where there are large and growing populations of infected people. This column assesses whether mass deworming has been ‘debunked’ in favour of deworming on a case-by-case basis, as has recently been reported, but with a particular focus on education. Mass deworming usually takes place in schools and therefore plays a huge and under-researched role in getting children to turn up to school. In fact, it is a more cost-effective way of increasing school attendance than a number of other popular policy options.