Why Does Toothpaste Make Everything Taste Bad?

Have you ever noticed that toothpaste makes some yummy foods, like orange juice, taste awful? QQ explains!
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Sources:
http://chemse.oxfordjournals.org/content/5/4/317.full.pdf
http://mentalfloss.com/article/20151/why-does-everything-taste-bad-after-you-brush-your-teeth
http://health.howstuffworks.com/mental-health/human-nature/perception/orange-juice-toothpaste.htm

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