Johnson & Johnson said on Wednesday it had withdrawn all lots of its Listerine Agent Cool Blue Plaque-Detecting Rinse after determining that the product's preservative did not effectively control certain microorganisms.
J&J said its McNeil-PPC division had recalled about 4 million bottles of the product, which comes in Glacier Mint and Bubble Blast flavors.
"The company conducted a thorough assessment and concluded that the risk of illness in healthy individuals following use of this product is very low," J&J said in a release. It said no consumers had reported adverse health events due to use of the rinse.
But J&J said the product could pose "a significant health risk to individuals with weakened or suppressed immune systems."
The company said the year-old product tints plaque blue for better brushing.