From the BBC World Service: Flossing is widely recommended, but for those of us who do not floss, we might take comfort from an increasing number of dentists who believe it is not the best way to prevent tooth decay or gum disease. Tooth decay is caused when bacteria in the mouth digest sugar, producing acid which eats away at the teeth. Gum disease on the other hand, is caused by a film of bacteria on the teeth known as plaque which irritates the gums. So does flossing make any difference? Dr Nigel Carter is chief executive of the British Dental Health Foundation and Dr Ellie Phillips is a dentist in the US and author of Kiss Your Dentist Goodbye.