Â© 2013 WebMD, LLC. All rights reserved. The teeth are the hardest substances in the human body. Besides being essential for chewing, the teeth play an important role in speech. Parts of the teeth include: â¢ Enamel: The hardest, white outer part of the tooth. Enamel is mostly made of calcium phosphate, a rock-hard mineral. â¢ Dentin: A layer underlying the enamel.
While they are often used synonymously, the terms infectious disease and communicable disease do not have the same meaning. A communicable disease is an infectious disease that is easily spread from one human to another.
I would like a clearer explanation of the difference between infectious diseases and chronic diseases. Best Answer: infectious and chronic diseases are all brought on by mostly the same issues.(viral, bacterial and some a combo of environment, ie., chemicals, pollution ect).what makes them different is the body can let some of the virons run it's course, whereas the chronicity of a disease the body can't fight off.Diseases are always infectious, otherwise would wouldn't have them, regardless of the chronic nature or the short lived kind.hat makes them different is the body can let some of the virons run it's course, whereas the chronicity of a disease the body can't fight off. Diseases are always infectious, otherwise would wouldn't have them, regardless of the chronic nature or the short lived kind.