Fluoride is an ion derived from fluorine, a chemical element in the halogen group. It is negatively charged (F⁻) and is commonly found in various compounds. In nature, fluoride is present in minerals and soil, and it is added to many water supplies and oral care products for dental health. Fluoride plays a crucial role in preventing tooth decay by promoting remineralization of enamel and inhibiting the growth of harmful bacteria. However, excessive fluoride intake can lead to dental or skeletal fluorosis. In addition to its dental applications, fluoride is used in various industrial processes, including the production of aluminum and the synthesis of fluorine-containing compounds in the chemical industry.