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.
Then in 1938, nylon bristles replaced animal hair. A company called DuPont de Nemours introduced the first toothbrushes with nylon bristles. The first such toothbrush was called Dr. Westâs Miracle â Tuft Toothbrush.American Dental Association has described an ideal toothbrush to be having â a brushing surface 1 to 1.25 inches long and 7.9 to 9.5 mm wide, 2 to 4 rows of bristles and 5 to 12 tufts per row.he first such toothbrush was called Dr. Westâs Miracle â Tuft Toothbrush. American Dental Association has described an ideal toothbrush to be having â a brushing surface 1 to 1.25 inches long and 7.9 to 9.5 mm wide, 2 to 4 rows of bristles and 5 to 12 tufts per row.