Just as the subject states "Do you believe sodium fluoride is poisonous"?
Thanks & God Bless
Everything is "poisonous" at the right amount of ingestion including water.
If you are worried about the fluoride in your water, don't. It probably does almost nothing to prevent tooth decay, but end the end it is benign.
Oral health has a lot more to do with the pH level you maintain in your mouth and whether it allows a habitable place for bacteria to quickly multiply.
Grew up without using fluoride in my dental hygiene (sodium bicarb) and nearly none in my water (cistern).
Been to the dentist maybe four times in my life. First time at the age of 22 or so to get my wisdom teeth shattered out of my head.
The hygienist asked if it had about a year or so since my last cleaning due to the calculus build up.
For oral health:
Inherit a body in which your mouth is rather neutral in pH. Hormonal changes will alter the pH in the mouth, explaining onset of cavities in puberty and pregnancy rather than poor hygiene.
Flossing is pretty much all you have to do.
Brushing is pretty much pointless as most people do it incorrectly and what it primarily is for is accomplished by flossing (getting oxygen to places where anaerobic bateria flourish).
I brush occasionally, maybe once a day. Keep meaning to floss. But I have been a toothpick user all my life.
Not a cavity yet and great gums since I haven't wore them down with brushing them away. I even now just scrap the calculus build up myself. My dentist suggests stopping by every three years or so.
So floss and don't worry about the fluoride. And you are 90% good.
Oh yeah, we were too poor for anything besides subsidized milk and water, so not drinking or eating sugar constantly is a good idea as well.
Genes like in most thing trump. Don't drink or eat a lot of simple carbs and floss.
And I work for Leviathan that makes most of your oral care products. They don't want you to know this.