Final answer:
Dentin is the soft tissue that separates the enamel on the crown of the tooth from the underlying pulp and nerves.
Step-by-step explanation:
The soft tissue that separates the outer enamel from the pulp and nerves of the teeth is dentin. The structure of a tooth consists of a visible crown, and underneath it is a layer of dentin, which extends into the root around the pulp cavity. The enamel is the hardest material in the body and it covers the crown of the tooth. The dentin is a relatively hard tissue that provides another layer of protection to the innermost pulp cavity, which is rich in blood vessels, lymphatic vessels, connective tissue, and nerves.