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Toothpaste is enriched with fluoride to help prevent tooth decay. Fluoride ions are anions, meaning they have a negative charge. (Take a look at where fluoride falls on the Periodic Table -- fluoride ions want to gain an electron to be more stable, thus they tend to form ions with a -1 charge.)

Substances with negative charges are basic, while those with positive charges are acidic.

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15y ago

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