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Why does toothpaste for sensitive teeth say to use it for only a month?

Asked by MissAnthrope (21511points) April 19th, 2010

I’ve used two different kinds in the past year and they both instruct to not use more than 30 days (or as instructed by a dentist). When I stop using them, my teeth get sensitive again, so what is it about this toothpaste that I shouldn’t use it for more than a month?

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