The pulp is responsible for giving tooth sensitivity, that is, allowing you to feel cold and hot foods. It is protected by the hard tissues that make up the tooth
A dead tooth no longer has the pulp, i.e., its vital part is not alive. This occurs when the blood supply to the tooth is cut off due to trauma or decay.
Generally, people do not realize that they need treatment; however, dead teeth can become discolored, turning black or brown. This affects the aesthetics of the smile if it is a front tooth.