The crown is the part of the tooth that you can see above the gum. The neck is the part of the tooth that is between the root and the crown. The root is the part of the tooth that is below the gum. The top layer of the crown is enamel. Below the enamel is dentin, which surrounds the pulp. Inside the pulp are the blood vessels and nerves of the tooth. Some teeth have only one or two roots, but molars can have four roots.