Fluoride ions are negatively charged particles formed when a fluoride atom gains an electron. They are commonly found in nature, particularly in minerals and water sources. Fluoride is known for its role in dental health, as it helps to strengthen tooth enamel and prevent cavities. In addition to dental applications, fluoride ions are used in various industrial processes, such as in the production of aluminum and certain chemicals. They can also be found in some toothpaste and mouth rinses, where they contribute to oral hygiene by promoting remineralization of teeth and inhibiting harmful bacteria.