Teeth are important tissues of the body, not only for daily eating, but also for their impact on the body. When problems with the teeth extend to the dental nerve, it can have a serious impact on the body. The nerve is originally white and can change color if the tooth is damaged. Although the nerve is white, but in daily life without regular brushing and regular health care, teeth can easily form calculus due to long-term accumulation of food and consumption of more pigmented food. Calculus is the main cause of periodontal disease. Periodontal disease not only causes pain to the body, but in severe cases it can also injure the nerve, causing it to become necrotic and turn from white to black. This is the most important reason for the discoloration of the dental nerve. In daily life, if you eat some sweet food or food that is irritating to teeth for a long time, it will easily lead to the teeth to become caries. Tooth decay can easily lead to necrosis of the nerve and the nerve in the pulp is exposed for a long time, and the nerve will become black. The nerve is originally white, so in order to avoid blackening, it is recommended to develop good oral care habits. Brush your teeth regularly, take care of them regularly, and have them scaled regularly; go to a regular hospital when there are problems with your teeth to prevent further deterioration and injury to the nerve.