Is it absorbed through skin pores when we put on sunscreen??

No, and there is no reason to believe it's toxic if you read the Wikipedia article.

> In 2021, the European Food Safety Authority (EFSA) ruled that as a consequence of new understandings of nanoparticles, titanium dioxide could "no longer be considered safe as a food additive",

Taken at face value that quote seems like reason enough to at least suspect that there's a possible problem. It also says that by the time they did that France had already banned it.

The fact that a bunch of people evaluated evidence that gave them significant concern doesn't prove that they're right, but it is some reason to believe it's toxic... It's not a lot very strong thing to base that belief on, but it's something. Reading that alone I would try to avoid the stuff until I got the chance to look into what all that evidence was.

That's assuming the article can be taken at face value. This is wikipedia after all. I did notice that there was a prominent statement right at the top of the "Health and Safety" section which says it "is regarded as "completely nontoxic". Maybe that is true, but the citation points to a source from 2006 while the EU decided to ban it 15 years later after "new understandings of nanoparticles".

It's banned in every European country I've been. In the US, it's in pretty much every popular toothpaste one can find including all the big brands.