I have seen this work on 2 broodmares, with ENORMOUS sarcoids on their lower legs. They looked like they were growing an extra hoof before treatment.
The toothpaste used was a particular brand, that contained an active ingredient that most other toothpastes don't contain. I'll have to ask my friend what it was called, as she had it imported from the US.
It did take a long time, but both sarcoids have reduced to being only a small bump and scar.
Our vet was so impressed, they they are considering investigating the 'active' ingredient, and creating a paste to market specifically for sarcoids.
KV, I don't think fluoride is the ingredient, we've got it in all our toothpastes here but didn't have this particular ingredient that was required for the sarcoids so needed to get boxes of it shipped from the US.
I'll speak to the lady soon and let you know what the brand is.