Root
The hard part of the tooth is actually not a living structure. The living structures are the nerves and blood vessels that are inside the tooth.
Root
Enamel is called the dentine part of the tooth
The part of the tooth that fits into the socket of the jaw(mandible) or maxilla(for upper teeth) is the "root" of the tooth.
The part of the tooth that is not living is the enamel, which is the hard, outer layer that protects the tooth. Enamel is primarily composed of minerals, mainly hydroxyapatite, and does not contain any living cells or nerves. Beneath the enamel lies the dentin, which is living tissue, and the pulp, which contains nerves and blood vessels.
The part of the tooth that is visible above the gum line is called the crown. This is the part of the tooth that is typically covered with enamel and is responsible for chewing food.
Pulp
The part of a tooth that is exposed and above the gum is called "crown", not to confuse with a crown that is prothesis to restore a heavily damaged tooth. The part of a tooth that is hidden inside the bone is called "root".
Crown
The visible portion of the tooth is called the crown. The submerged portion is called the root.
The living tissue in the center of a tooth is called the pulp. It contains blood vessels, nerves, and connective tissue that help nourish the tooth and maintain its vitality. If the pulp becomes infected or damaged, a root canal treatment may be necessary to save the tooth.
The part of the tooth that is covered with enamel is the crown.