The pulp becomes necrotic because of tooth trauma or tooth decay, and the tooth will appear greyish-black. Endodontic treatment must be done to treat the discoloured tooth which has pulp necrosis. If teeth still appear greyish-black, dentist can treat the discolored teeth by bleaching , laminate veneer or crown .
Reasoning, as a way of proving arguments, comes in many different forms. Different forms of reasoning are accepted in different fields and contexts. Arguing with family members generally relies on different methods of reasoning than arguing with professors.
An argument is a rationale in which the reason functions as evidence in support of the conclusion. Its purpose is to provide a rational basis for believing the conclusion to be true. An explanation is a rationale in which the conclusion represents an accepted fact and the reason represents a cause of that fact.