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I was taught to not rinse, I just wash the outside of my lips & face to freshen you. I presume that lets it linger longer and also you'll swallow some so will be absorbed that way too.

Toothpaste is poisonous isn't it? Swallowing it wouldn't be something that makes me happy.

As far as I'm aware not in any dose you're ever likely to ingest. What are your sources?

Sadly this is from a paper I read when I was somewhere between 8 and 13 so it is entirely possible I formed the wrong conclusions at the time.

Edit: Needless to say, I don't remember the title. Perhaps I should re-investigate it.

Not rinsing at all. It just stays on there, bit weird to begin with but you get used to it.

Don't rinse at all, is a pretty common recommendation.