I've tasted salt from my teeth before too. It didn't last for very long (a few days), and it doesn't happen very often. It seems to strike my crowns. I haven't experienced it with my intact teeth. I have no idea what it is. It doesn't correlate with any particular foods, dental care products, or dental procedures.
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August 16, 2007 - Braced on top
January 3, 2008 - Braced on bottom