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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I don’t know, but I was looking at the advice on the British National Health Website today, and it specifically advises:
*do not use mouthwash straight after brushing your teeth*
https://www.nhs.uk/conditions/gum-disease/
So the advice actually seems quite contradictory.
https://www.nhs.uk/live-well/healthy-teeth-and-gums/how-to-keep-your-teeth-clean/
*Should I use mouthwash?*
*Using a mouthwash that contains fluoride can help prevent tooth decay, but don’t use mouthwash (even a fluoride one) straight after brushing your teeth or it’ll wash away the concentrated fluoride in the toothpaste left on your teeth.*
*Choose a different time to use mouthwash, such as after lunch.*
*Don’t eat or drink for 30 minutes after using a fluoride mouthwash.*
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