What Is the Chemical Formula for Fluoride in Toothpaste?

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The most common type of fluoride found in toothpaste is part of the compound sodium fluoride, which has the chemical formula NaF. Other types, such as stannous fluoride (SnF2), are sometimes used in toothpaste. Fluoride is a negative ion of the element fluorine, which is used to help strengthen tooth enamel and prevent tooth decay.