The part of the tooth that is usually visible over the gum is called the crown and the part that is attached to the gum is called the root.

Enamel is the outer calcified tissue layer covering the crown of the tooth. It is one of the hardest substances in the body.

Dentine is the inner tissue layer that lies beneath the enamel or cementum.

Cementum is the hard outer tissue layer covering the root and attaching the surrounding gum tissue to the root of the tooth.

Dental Pulp is the center part of the tooth that consists of blood vessels and nerves that enters the tooth from a hole at the bottom of the root.

Gingiva (Gum) is the soft tissue covering the necks of the teeth.

Bone or the alveolar bone is the part of the jawbone that surrounds the root of the teeth