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Hydrated silica, which is primarily used as an abrasive in toothpaste, is made from a crystallized compound found in quartz, sand, and flint.

Diatomaceous earth, originally mined as "tooth powder" is a naturally occurring hydrated silica. As a fine gel abrasive, frequently combined with softer calcium carbonate (from chalk) it helps to remove plaque. Milled to a slightly larger size, the grains are more aggressive and are used in tooth bleaching formulations.

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11y ago

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