Here's what the colour mark on a toothpaste tube actually means | The Times of India
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Is there any meaning behind the color codes of toothpaste (green, blue, red and black)? - Quora
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What are all those colors on the toothpaste tubes? Which toothpaste is best?
Why toothpaste tubes have coloured square markings – and the myth about them - Mirror Online
Do Color Codes on Toothpaste Tubes Identify Their Ingredients? | Snopes.com
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How does toothpaste work?
