Two things need to be noted:
1. I do not use a whitening toothpaste, so any whitening that happens is all because of Listerine.
2. The Listerine Whitening Pre-brush Rinse says that it only shows results after a whopping 12 WEEKS. For my purposes, however, I am only using it to supplement the Listerine Whitening Dissolving Strips. I'll continue to use it after my 2 weeks is completed, but not for the full 12 weeks.
-Each bottle contains approximately 32 days worth of fluid, and I don't know if another bottle would be worth it--since it does take so long to even show results.
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