The article already has one example: “Juneau, Alaska, voted to remove fluoride from its drinking water in 2007. A study published in the journal BMC Oral Health in 2018 compared the dental records of children and adolescents who received dental care for decaying teeth four years before and five years after the city stopped adding fluoride to the water. Cavity-related procedures and treatment costs were significantly higher in the latter group, the study found.”

Fun fact - we will intentionally inject (small) bubbles of air into your veins to look for connections between chambers of your heart that shouldn’t be there. It’s called a Bubble Study. https://www.health.harvard.edu/heart-health/what-is-a-bubble-study

I think it’s from the boot camp scenes in the movie Full Metal Jacket.