[asdfasgasdgasdg]

Only about 10% of it, according to Wikipedia. https://en.wikipedia.org/wiki/Fluoridation_by_country (75% of those with community water systems in the U.S., for reference.)

[edoceo]

10% of water in UK, not 10% of toothpaste.

[asdfasgasdgasdg]

Sure. Of course toothpaste has flouride. There's nowhere that's untrue, I assume. But the person I responded to made a claim about water flouridation in the UK which was mostly false.

[jml7c5]

There are actually fluoride-free "natural" toothpastes that have unfortunately been growing more common. As one might expect, they are of dubious effectiveness.