[Secret Agent Man]

sodium fluoride is regularly added to water by water treatment plants. it is still used. it is also the type used in all major toothpaste brands.

[okie01]

Many locations have naturally fluorinated water, so that there is no need to add a fluoride compound.

I worked on Crest toothpaste at P&G at the time of the ADA endorsement. The active ingredient in Crest was originally stannous fluoride, rather than sodium fluoride.

I can attest to the validity of the clinical tests which revealed 30-50% reductions in the incidence of caries. Indeed, since Crest's introduction, childhood caries problems have essentially been wiped out. A huge step forward in public health...

[Sir Francis Dashwood]

Sodium silicate is also added regularly to water supplies... Somethings are added in some places that are not added in others...

I’m generally suspicious of anything added to the water... I don’t know who is adding things, when, where or how much... some water in California smells like a swimming pool...

Some of the idiots working for water companies or public water utilities couldn’t measure a gallon accurately, let alone calculate molar volumes and empirical formulas.