My Listerine mouthwash bottle directions says that for best results use twice a day after brushing. My toothpaste has 1450ppm fluoride, whereas the mouthwash is only 450ppm. Won’t using the mouthwash afterwards simply wash away the higher, more beneficial levels of toothpaste fluoride and replace it with lower mouthwash levels? What’s the reasoning for this advice?
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Mouthwash is not aboit fluorine but killing bacteria. It act mostly on surface and not in depth. Before brushing you have a layer of biofilm, bacteria, food and the like. Mouthwash kill the bacteria on the surface of the biofilm, but not in depth. Bacteria grow. Fast. It will come back.
Now, brush and remove that biofilm. Then mouthwash. It can now kill the thin layer left in your mouth as it is not thick anymore.
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