enamel

Enamel is the hard, outermost layer of a tooth, primarily made of tightly packed mineral crystals called hydroxyapatite. It serves as a protective barrier that shields the inner dentin and pulp from decay, bacteria, acids, and physical damage. Enamel is the strongest substance in the human body but is not living tissue, meaning it cannot repair itself once damaged. Its durability is essential for maintaining tooth function and appearance, and good oral hygiene helps preserve its strength. Despite its resilience, it can wear down over time due to factors like acids, abrasives, and aging.