i don't have the metallic taste but have noticed an increased sensitivity in my receding gums. i think i need to start oil swishing again! maybe you should do the same.
i know that some websites list metallic taste, frontal lobe headache and other so-called "symptoms" an allergic reaction to the iodine...but this is not an allergic reaction...it is detox i am sure. others have claimed they have had wicked breath too and other weird mouth related symptoms. maybe you should up your vitamin C and salt....or maybe not enough people are addressing fluoride detox symptoms yet.
i just started eating tamarind. i found some site and experiments indicating tamarind flushes fluoride out of the body.