Enamel

Definition

Enamel is the hard, protective outer layer covering the crown of a tooth. It is composed primarily of hydroxyapatite, a crystalline calcium phosphate, making it the hardest substance in the human body.

Related terms

Dentin: Dentin is the layer beneath the enamel that provides support and absorbs shocks that could damage the inner parts of the tooth.

Pulp: The pulp is found at the core of a tooth, containing nerves and blood vessels that provide nutrients and sensory function.

Plaque: Plaque is a sticky film of bacteria and sugars on teeth that can erode enamel and lead to cavities if not removed through brushing and flossing