Which part of a tooth is considered the most vital substance?

The pulp is considered the most vital substance of a tooth because it contains the nerve tissues, blood vessels, and connective tissues essential for the tooth's vitality and overall health. The pulp is responsible for providing nutrients to the tooth and plays a crucial role in sensory functions, which means it helps the tooth respond to stimuli such as temperature and pain.

The pulp is located at the center of the tooth and, if compromised through decay or injury, can lead to serious health issues, such as infection. Unlike the other layers of a tooth, which serve protective or structural roles, the pulp is living tissue that must remain healthy for the tooth to remain viable. This distinction emphasizes its critical importance in dental health and the overall function of the tooth.