I'm sceptical of this source. The post claims fluoride in toothpaste (which isn't even ingested!) is a neurotoxin and refers to a review which I cannot find (https://scholar.google.com/scholar?hl=en&as_sdt=0%2C5&q=lanc... doesn't come up with much, closest I got were https://www.thelancet.com/journals/laneur/article/PIIS1474-4... and follow-up https://www.thelancet.com/journals/laneur/article/PIIS1474-4..., neither of which discuss fluoride toxicity in toothpaste). I think we should take this author's claims with a generous helping of salt.

With that said, I wouldn't eat the stuff, but this post goes a lot further than that.