Try Zycam rapid melts. I noticed a coincidental elimination of an up and coming canker sore while fighting a cold. Ever since when I feel an area begining like a canker sore I take Zycam and it ceases. I have read that a possible link to canker sores is low zync and immune system deficiencies. I'll settle for temporary metal aftertaste any day than suffering through a canker sore. One more note, you have to take it before the sore ruptures or turns into an ulcer.
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