What dental experts say about how you're brushing your teeth

Few people know more about the best way to clean your mouth than Dagmar Else Slot and Fridus van der Weijden. This Dutch dental duo has authored more than 100 research papers together, and now they’re attempting something especially ambitious: writing the definitive guide to cleaning your teeth and gums. Slot, a dental hygienist, and van der Weijden, a dentist, have made this guide their life’s mission. They’ve been at it for 15 years, and they’re not done yet.