I was wondering the same thing. I have been using a liquid generic Anbesol and when I pull the applicator out of my mouth after rubbing it on my gums it is chalky white, almost hardened. I didn't know if it was a reaction caused by oxygen or perhaps because it may be expired. Sometimes if I spit afterwards small "chunks" of white are present. I will be watching for an answer as well.. thanks for the question!
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