Teeth are actually living structures, though they may not look it. The bonelike enamel, or crown, on the outside of each tooth hides an interior chamber filled with dentin. This is a rigid mesh of mineralized connective tissue. Each tooth’s core consists of nerves encased in a pulpy sheath under this layer of dentin. Canals in the center of each tooth root allow nerves to pass through. Your teeth are anchored in your jaw by sturdy ligaments and a material called cementum.