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It's a physical action without toothpaste. Many toothpaste have inactive ingredients, and are only there to "taste good". Toothpaste with fluoride, baking soda, and other common dental ingredients will undergo small chemical changes when they come in contact with water (when baking soda in water come together it creates a chemical reaction). So in some respects it's both!

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15y ago
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12y ago

Without toothpaste it is a physical change. With toothpaste it is a chemical change. :)

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10y ago

Brushing teeth is not a chemical reaction;

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10y ago

Brushing is a mechanical process; but toothpaste is a chemical product.

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Q: Is brushing your teeth a chemical change?
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