How many times have our parents, grandparents, and other relatives told us to stop chewing with our mouths open? It's most likely one of the first table manners you learned — followed closely by always using a fork and wiping your face with a napkin. Now, a British researcher claims that all those proper etiquette habits that we are told to learn actually impact how good food tastes. Professor Charles Spence, an expert from Oxford University, says that chewing with your mouth open makes your food taste even better.