Does root canal treatment affect my health? This is a very common clinical question and a misconception among many of our Chinese people. Many people often ask, “If you pull out my nerve, does it affect the brain? Because he thinks that the nerve must be connected to the central system of the brain, which is a misconception. We usually refer to the nerve, when others think that the nerve is in charge of my senses, this is correct. But the nerve that we usually refer to in the dental clinic nowadays is only the pulpal nerve, the nerve inside the tooth, what is the role of this nerve? It is the one that senses stronger physical (e.g., hot and cold) and chemical (e.g., sweet and sour) stimuli. Under normal circumstances this part of the nerve does not transmit significant sensory signals to the brain. The tooth is a hollow tube with nerves and blood vessels, as well as arteries and veins. The role of the nerve is mainly to nourish the cells inside our teeth to create dentin cells, which are repaired by dentin proliferation during the process of minor wear or even long natural accumulation of heavy wear, which is a human protective mechanism. Partly to maintain the thickness of the tooth, the hard tissue of the tooth will grow a little, but this rate is limited and decreases with age. When the nerve is removed, this function is gone, resulting in the loss of the tooth’s nutrient metabolism, and the tooth becomes discolored and brittle. The sensory nerve is not the pulpal nerve, but the periodontal nerve, so “pulp extraction” has no effect on this sensation.