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by anglrckx on January 6th, 2007
When something cold touches the roof of your mouth on a hot day, it triggers a cold headache. The cause is a dilation of blood vessels in the head. The dilation may be caused by a nerve center located above the roof of your mouth -- when this nerve center gets cold, it seems to over-react and tries to heat your brain.
Therefore, the easy way to avoid "brain freeze" is to keep cold things away from the roof of your mouth!
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