Dental enamel is the hard, outer layer of a tooth that protects it from decay and damage. It is the hardest substance in the human body, primarily composed of minerals, mainly hydroxyapatite. Enamel serves as a barrier against acids and bacteria, helping to maintain the health of the underlying tooth structure. Although dental enamel is strong, it can be worn down by factors such as acidic foods, sugary drinks, and poor oral hygiene. Once enamel is lost, it cannot regenerate, making it essential to take care of your teeth through regular brushing, flossing, and dental check-ups.