FDA notified dental healthcare professionals and patients of the risk of serious allergic reactions in users of denture cleansers. These adverse events, including abdominal pain, vomiting, seizures, hypotension and difficulty breathing, have occurred both when the product has been used properly as well as from improper use. These events can occur soon after first use or after years of use. FDA believes that the ingredient responsible for these reactions is persulfate, a known allergen. Persulfates are used in most denture cleansers to help clean and bleach the dentures. FDA is recommending that all manufacturers of denture cleansers modify their labeling to include warning information that the product contains persulfates and recommends improving the directions for use on their labeling in order to reduce misuse.
Source: http://www.fda.gov/cdrh/safety/022508-denturecleansers.html
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