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.
Abstract reasoning refers to the ability to analyze information, detect patterns and relationships, and solve problems on a complex, intangible level. Abstract reasoning skills include: 1  Being able to formulate theories about the nature of objects and ideas. 2  Being able to understand the multiple meanings that underlie an event, statement, or object. 3  For example, realizing that the Liberty Bell is not just a piece of American history, but it is also a symbol of freedom.