First, I found out I was flossing wrong. Then I learned I’d misunderstood some pretty fundamental rules about using mouthwash.

And now, the NHS has taught me that I don’t know how to read a toothpaste packet properly.

If you’re anything like me, you look at the shiny displays on the shelf and try to find whichever product best suits your need, whether that’s tooth whitening, improving gum health or settling sensitive gnashers.

I’d always assumed that the levels of fluoride, which helps to prevent cavities by strengthening our tooth enamel, were equal across most toothpaste brands unless they specified otherwise.

But not all options are created equal, it seems.

How much fluoride should my toothpaste have?

The NHS says that though it’s important to pick a brand with “the right concentration of fluoride”, not all of them pack the same........

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