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Airports are separated from all societal norms
(startrek.website)
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I found out in some cultures brushing your teeth three times a day is the norm.
I asked my dentist about it and he said if you brush twice a day and floss once a day that's the most important. You're better off doing something else, like not eating sugar, probably won't get much benefit from brushing three times a day.
Maybe you need a better electric toothbrush or your toothpaste is shit?
That and following any "bad for teeth" food or drink with something neutral/good to mean it's not just sitting there.
Glass of water after sweets/coffee/coke/etc..