![A poster from the 1970s promoting good oral hygiene by drinking fluorinated water.](/sites/default/files/styles/large/public/SB%202%204%20rules%20for%20good%20health.jpg?itok=IZPLdFeI)
4 Rules for Good Teeth
![A sign near Morongo Valley, CA warning that the water exceeds the maximum level for fluoride.](/sites/default/files/styles/large/public/3498732986_580d1c0811_z.jpg?itok=4kSEAI8d)
Fluoride Warning
![A phosphate museum in Mulberry, FL.](/sites/default/files/styles/large/public/SB%205%20Mulberry%20Phosphate%20Museum.jpg?itok=8I2r3PMM)
Mulberry Phosphate Museum
![An 1892 map of phosphate deposits on the western edge of Florida.](/sites/default/files/styles/large/public/5%20Pebble%20Phosphate%20Region.jpg?itok=rVByn6sd)
The Pebble Phosphate Region of Florida
![A 2009 map depicting global fluoridated water usage.](/sites/default/files/styles/large/public/6%20Fluoridated%20Water%20Map.jpg?itok=zrco480u)
Fluoridated Water Map
![Severe fluorosis, brown discoloration and mottled enamel, in an individual from an area of New Mexico.](/sites/default/files/styles/large/public/11%20Severe%20Fluorosis.jpg?itok=asanOGrU)
Severe Fluorosis
![A dentist examining children’s teeth at the Pine Ridge Indian Reservation.](/sites/default/files/styles/large/public/10%20Dentist%20with%20Patients.jpg?itok=1SnRKRR9)
Dentist with Patients
![A 2009 map depicting areas with groundwater fluoride concentrations above the recommended levels.](/sites/default/files/styles/large/public/18%20Fluoride%20Concentrations.png?itok=1vZGGAcS)
Fluoride Concentrations
![An advertisement for Crest tooth paste from 1958.](/sites/default/files/styles/large/public/21%20Look%2C%20Mom--no%20cavities%21.jpg?itok=_gWKStgs)
Look, Mom—no cavities!
![A scene from the film Dr. Strangelove.](/sites/default/files/styles/large/public/24%20General%20Jack%20D.%20Ripper%20and%20Group%20Captain%20Lionel%20Mandrake.png?itok=GsgUM20x)
General Jack D. Ripper and Group Captain Lionel Mandrake
![Colgate, like most American toothpastes, indicates the presence of fluoride by including it as part of the name.](/sites/default/files/styles/large/public/27%20Colgate%20Fluroide%20Toothpaste.jpg?itok=zDCr61n7)
Colgate Fluoride Toothpaste
![Graffiti in Wellington, New Zealand declaring that fluoride causes cancer and questioning why it is added to water.](/sites/default/files/styles/large/public/6095510842_fcc677c0e1_z.jpg?itok=5nON_bu6)
Fluoride and Cancer Graffiti
![A sticker on a city electrical box in Vancouver, WA from Info Wars, a right-wing media organization known for promoting conspiracy theories.](/sites/default/files/styles/large/public/28406586753_469f048f14_z.jpg?itok=F0SyNgvC)
Poison in the Tap Water