• grue@lemmy.world
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    18 days ago

    Just because you drank the water when it was fluoridated doesn’t mean you should swallow the toothpaste if the water stops being so. Once the fluoride was in your mouth it had already done its job, being absorbed directly into your tooth enamel. You were drinking the water because it was water, not because it was necessary to do so for the fluoride to work.

    That’s why when you’re a kid getting a fluoride treatment at the dentist, they do it by putting gel in a mouthguard-like thing, rather than giving you a pill to swallow.