What exactly is fluoride? It is an ion that comes from element number 9, fluorine. Fluoride is a natural mineral that can be found in many different places. It can be found in soil, air, plants, animals and in water. When hearing the word “fluoride” many people think of that flavoured mouthwash you receive when you go to the dentist. Fact is that many dental products such as toothpaste, contain the fluoride ion. In addition, fluoride is commonly added to water because of its effects on dental health. The most common additive is fluorosilicic acid. It both strengthens and protects the tooth enamel to help resist tooth decay.