Note: Chlorhexidine may cause staining of the tooth, tooth filling, and dentures or other mouth appliances. Tetracycline use during tooth development phases (from the last half of pregnancy through eight years of age) may cause permanent discoloration (yellow, gray, brown) of teeth.
What is Coal made of? Coal is made from trees or plants that decayed on the ground for millions of years. The remains of various plants and trees then mixed with the other components of the ground and eventually going through several natural processes making them more like solid rocks.
Coal is mainly composed of carbon, oxygen and hydrogen. Humans use  coal in the manufacturing of steel, in generating electricity, as a  source of heat, as a liquid fuel and â¦ in the manufacturing of  cement.3 people found this useful.lean coal is a term for technology (Clean coal technology) that  mitigates emissions of carbon dioxide (CO2) and other greenhouse  gasses that arise from the burning of coal for electrical power. It  reduces the harmful emissions caused by the burning of fossil  fuels. 9 people found this useful.