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.
Infection and Disease are two words that are often confused as one and the same. In fact these two medical terms are different in their meanings. Infection is understood in the sense of contamination.Contaminating air or water with harmful organisms is said to cause infection.nfection affects a person with disease. On the other hand disease is the end result of an infection. This is the main difference between infection and disease. In short it can be said that infection leads to disease. A person gets a disease if he or she carries an infection.