Listerine's Agent Cool Blue has been recalled as of now. If you haven't already stopped using it, please do. I guess their preservative was inadequate Press Release
This affects all flavors & all lots. There is a form that you can mail your upc to to get a full refund.
According to their press release no one has gotten sick yet and the risk is very low to most people.
If you have no idea what I'm talking about, you probably don't have it! My kids are obsessed with it, just love to turn themselves blue!!! The Princess got into it 2 weeks ago while we were waiting for the bus & turned the bath rug blue... not sure I'll be buying it again.