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.
Because coal and most limestones are formed from organic material (living things). Coal is formed from compressed plant material, and limestone from animal remains (hard parts â¦ : soft parts are almost always rotted, broken by force or consumed by predators).oal is an organic sedimentary rock because it forms from the remains for plant material. Source: California Edition, Earth Science; Geology, the enviorment and the Universe Pg. 131.