What about the fluoride treatment at the dental office?

Fluoride treatments can contain between 10,000 to 20,000 ppm. There is no regulated dose requirement. There are cases known of children dying in the dentist's chair.

(New York Times, Jan.20, 1979: "$750,000 Given in Child's Death in Fluoride Case" about a three year old child killed by fluoride treatment in the Dentist's office.)