This may sound weird but is it possible that some mainstream toothbrush brands contain Fluoride? and no I don't mean toothpaste.?

what would an example of a toothbrush brand that isn't toothpaste? Do you mean, does the toothbrush have fluoride embedded in it?

There are many fluoride rinses.

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Like, physically possible? Yeah sure, but it's highly unlikely because flouride salts are crystalline. You'd notice if your toothbrush had crystals in it, or if the crystal had been ground into a powder you'd notice that too. <