05-07-2008, 07:10 PM
Run away. Here's a quote from one of the users:
I looked up the "active" ingredient in Crest Pro-Health online, called cetylpyridinium chloride. This is what the Materials Safety and Data Sheet has to say about this ingredient: "Toxic if swallowed. Very toxic by inhalation. May cause severe eye irritation. Respiratory and skin irritant," with a large TOXIC warning at the top of the page.