As the data presented throughout this website indicates, the ethics & safety of adding fluoride chemicals to public water is highly questionable.
Dental & public health associations' own guidelines for daily fluoride limits from dental products & fluoridated water are inconsistent & contradictory.

Furthermore, when it comes to water fluoridation, according to dentists including NB Dentist, Roger Richard, dental associations focus on defending & promoting 60 year old policies rather than acknowledge the lack of safety studies,
 people's overall fluoride exposure from all sources & the ongoing research indicating long term adverse effects from fluoridated water.
To make matters even more controversial, when municipalities fluoridate their water they do not use pharmaceutical grade chemicals which are used in dental products & prepared in laboratories to ensure high levels of purity. The vast majority of municipalities who still fluoridate actually add industrial grade fluoridation chemicals from the phosphate fertilizer industry that come with trace amounts of arsenic, lead and other contaminants.
To be clear, the trace amounts of arsenic, lead & other contaminants are so small that once diluted they usually do not exceed their regulated safe drinking water limits. However, as Paul Van Caulart, one of Canada's top water treatment experts, explains in his video presentation on this page, public water limits for arsenic, lead, & other contaminants were devised to regulate natural occurring levels of these toxins, & not to regulate the purposeful addition of these toxins. So there you have it, on top of all the controversy of increasing people's exposure to fluoride, fluoridated water is also a way for the phosphate fertilizer industry to sell their waste rather than pay to have it disposed of.
3 min: What are industrial
fluoridation chemicals
9 min: Paul Van Caulart,
 Canadian Water Treatment Expert
No Safety 
Studies
Hopefully more & more people will choose to learn the basic principles for evaluating the validity of data. After all, just like a juror in a court of law, we all have the capacity to seek clarification about what is the most relevant, verifiable & least biased evidence available for any particular controversy.

Whether we are an elected official, administrator, PhD or lay person, these are the skills we all need to learn & practice
in order to develop truly informed perspectives on any issue.