Britain has long had a global reputation for bad teeth, and scientists now say we may have the worst in the nation’s history. After examining the teeth of 17th-century skulls, researchers from Queen Mary University of London found fewer missing teeth and less decay than today, blaming widespread sugar consumption and lack of basic hygiene for the sorry state of our teeth. Here, then, is an ultimate guide to optimum dental care. How should you clean your teeth? The steadfast…