Yes it does! What you feed your body also affects the oral cavity; after all, your mouth is part of your body! The food you eat may contain vitamins and minerals, or important proteins that help your body out, but also keep everything in your mouth functioning. For example, a lack of Vitamin C can not only cause scurvy, but can cause bleeding gums and gingivitis. A deficiency in Vitamin B and iron can cause cracked lips, mouth ulcers, inflammation or a burning sensation of the tongue! It's important to choose the right food, as it not only helps your muscles and connective tissues, but it can greatly benefit the oral cavity.