I can't directly answer your question, but I would get a different mouthwash for that use even if the Crest Blue was available, because of the colorings added. If you want to try to
buy a similar one here are the ingredients:
The active ingredient in Crest PRO-HEALTH Multi-Protection Rinse's formula is 0.07% Cetylpyridinium chloride (CPC).
The formula's inactive ingredients may include, but are not limited to, water, glycerin, flavor, poloxamer 407, sodium saccharin, methyl paraben, propyl paraben, propolyne glycol, blue 1, yellow 6, and green 3.