The non-novamin Sensodyne was tested at 116ppb for lead and the tester listed the concerning ingredients: hydrated silica and titanium dioxide, which both are in the Sensodyne with Novamin tube I have from the UK.

It says Sensodybe right in the article. However, typical Guardian, it is an article telling you what to think and not giving you all the information.

The question is, is there a safe level of lead, and are these tooth pastes under it?

Pretty sure the scientific consensus is there’s no safe level of lead exposure.

That is incorrect.

The ideal amount is zero. But 1 part per 10 trillion is safe.

So… we have an estimated upper limit. Could we lower it without being able to detect a change in health effects? Likely.

They only tested US toothpastes

Novamin toothpaste is only sold & mfg in the UK. There are some conspiracy theories going around that the ingredient is so good they won't sell it to us in the US! [1]

I actually buy it off Amazon and use it myself because I have teeth sensitivity and it contains no SLS, which causes some irritation for me. It is quite interesting stuff. I doubt it would have lead since a synthetic compound. [2]

[1] https://medium.com/@ravenstine/the-curious-history-of-novami...

[2] https://en.wikipedia.org/wiki/Bioglass_45S5

No, it's a trademark issue.

And, as Canada is a place, it has Novamin-based Sensodyne.

Can you share some sources?