There isn't sand in toothpaste, the grit that you think is sand are actually diatoms that are put into the toothpaste to help clean your teeth. They have a tough silicon structure which helps them scrap off other microorganisms. Diatoms have a lot of uses in industry as well.
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Kolnos is a brand of toothpaste. It is owned by Colgate-Palmolive Company.
Aim toothpaste
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Colgate toothpaste!