I often watch the television programme QI, Chaired by Stephen Fry. It is stuffed full of unusual facts and witty banter. In today’s revelations was the obscure piece of knowledge that crisps decay teeth worse than sweet sugary drinks. In fact, allegedly, they are about the worst thing a person can eat if they wish to escape tooth decay. For some unknown reason the most dangerous culprit is Cheese and Onion flavour!