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.
Practical reasoning is basically goal-directed reasoning from an agentâs goal, and from some action selected as a means to carry out the goal, to the agentâs reasoned decision to carry out the action. The agent can be a person or a technical device, such as a robot or a software device for multi-agent communications..