All mouthrinses will be in a plain package and dispensed by the faculty investigators. The package will be labeled with a code to indicate the product. Only the faculty investigators will have access to the code information. Directions for use will be contained in the package. The examiners will not see the product. The examiners will give instructions for mouthrinse use, but they will not be aware which rinse the subjects are using. Each product will contain two solutions which are mixed prior to use.