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There’s a foaming ingredient in toothpaste that blocks your ability to taste sweetness, which if you drink orange juice shortly after you only taste the acidity and bitterness of the fruit.–WTF Fun Facts

Source: https://www.colgate.com/en-us/oral-health/life-stages/adult-oral-care/orange-juice-and-toothpaste–why-they-don-t-mix