Weekly Floride Treatments-Weird to me

The school nurse came by the classroom this morning  and left these little cups filled with green liquid.  "Are they mouthwash," I asked the other teacher?
Chuckling, she replied, "No honey, they are fluoride treatments."

I had heard of these mythical treatments but have never seen them before, outside of that stuff the dentist puts on our teeth twice a year. That is what living in the country is all about, well water you can't drink because of high sodium content and Fluoride treatments.