What's the science behind a sweet tooth? James Gallagher explores whether sugar really can be addicted and what happens in our bodies when we want it and when we eat it.

He's joined by Professor Susanne Dickson, who specialises in the neurobiology of appetite at the University of Gothenburg, and Professor James Brown from the School of Biosciences at Aston University.

With Easter coming up, James meets dental hygienist and researcher Dr Claire McCarthy from King's College London in the BBC loos to get some top tips on keeping our teeth clean and gets a few pointers on where he could do with brushing up on his technique.

Presenter: James Gallagher Producers: Tom Bonnett and Hannah Robins Assistant Producer: Anna Charalambou