Parasitism is a relationship in which one organism (the parasite) benefits while the other(the host) is harmed. This is a positive, negative relationship. (Campbell)( Dionne L Rice Jr) The parasite usually lives on or inside the other organism. For example, mosquito is a parasite, feeding on a human while transferring the disease called Malaria.
Artificial brush fibres are most commonly made of nylon and polyethylene, though vinyl and steel wire are also used for certain applications. Nylon fibres are either tapered and split like hog bristles for use in paintbrushes or left untapered for making cleaning brushes, hair brushes, and toothbrushes.
Some other interesting toothbrush facts: 1  The first mass-produced toothbrush was made by William Addis of Clerkenwald, England, around 1780. 2  The first American to patent a toothbrush was H. N. Wadsworth, (patent number 18,653,) on Nov. 7, 1857.3  Mass production of toothbrushes began in America around 1885. About.com-Inventors-Dental Innovations-History of Dentistry-This site discusses the history of the toothbrush and toothpaste, including the first electric toothbrush invented in 1939. 2  Floss.com-This site provides dental trivia and tips as well as information on the origins of toothpaste and floss.