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What snus does to your gingiva
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Child’s skull with baby teeth and adult teeth, Hunterian Museum, London
by Stefan Schäfer on Flickr.
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white-coat:
Your brain is encased in connective tissue called dura matter. The human brain does not have any pain receptors, and therefore is not susceptible to pain. The dura, however, can feel pain. Because of this, it is theorized that inflammation of the dura is what causes major headaches.
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