Brushing your teeth a day should keep the dentist away. But if a group of scientific researchers have theirwish, it will make the rest of your body healty too. A toothbrush that checks blood sugar and bacteria while you brush is currently in development in the USA. It is one of many gadgets proposed by engineers and doctorsat the Center for Future Health in New York others include a pair of spectacles that help to jog your memory, and a home camera designed to check for cancer