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.
Reason is man's tool of understanding. It is the method of identifying entities through one's senses. It is the means of integrating those perceptions into concepts, gaining knowledge through this integration, integrating that knowledge into the rest of one's knowledge, and evaluating and manipulating ideas and facts. Reason is the process of thinking. Its fundamental attribute is clarity. The use of vague notions, fuzzy feelings, or instincts is not reason. Reason requires clear, identifiable building blocks. It uses ideas, memories, emotions, and sensory input.