We're constantly told we should be flossing our teeth - despite it being fiddly, time-consuming and sometimes painful.Figures show that less than a fifth of us actually bother to do it regularly - with many tacky rolls of floss gathering dust in bathrooms the world over.Now, one leading expert has warned that if not performed correctly, flossing can actually do more harm than good.Here, Robin Seymour, Emeritus Professor of Dental Sciences at Newcastle University and leading periodontologist, explains why - and suggests other, easier ways to get perfect pearly-whites...Facebook