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.
The definition of logic is a science that studies the principles of correct reasoning. 1  An example of logic is deducing that two truths imply a third truth. 2  An example of logic is the process of coming to the conclusion of who stole a cookie based on who was in the room at the time.