Of course fluoride is toxic, this is well established. Why do you think there's big bold text on the back of toothpaste tubes saying "DO NOT SWALLOW"? You're not supposed to INGEST toothpaste, you're supposed to brush your teeth with it, rinse your mouth and spit it out.
If you're paranoid about the BS fluoride conspiracy mind control rubbish, just use sodium bicarbonate and very diluted hydrogen peroxide, which costs next to nothing and doesn't contain anything harmful (unless you believe in the candida rubbish that all the alternative medicine types go on about, in which case you might want to avoid the bicarb because it's an EVIL ANTACID!!!!one1eleven!). There's no health benefit, though, unless you believe in the aforementioned fluoride conspiracy stuff, in which case you might get some placebo effect.