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You might think that a tooth’s nerve tissue is vitally important to a tooth’s health and function, but in reality it’s not. A tooth’s nerve tissue plays an important role in the growth and development of the tooth, but once the tooth has erupted through the gums and has finished maturing the nerve’s only function is sensory (it provides the tooth with the ability to feel hot and cold).
In regards to the normal day to day functioning of our mouths, the sensory information provided by a single tooth is really quite minimal. Dentists realize that on a practical level it is pretty much academic whether a tooth has a live nerve in it or not. If a tooth’s nerve tissue is present and healthy, wonderful. But if a tooth has had its nerve tissue removed during root canal treatment that’s fine too, you will never miss it.