The story of the water fluoridation controversy which has arisen from moral, ethical, political and safety concerns regarding the fluoridation of public water supplies. The controversy occurs mainly in English-speaking countries, as Continental Europe does not practice water fluoridation. Instead, fluoride is added to most table salt in Europe. Those opposed argue that water fluoridation imposes ethical issues, may cause serious health problems, is not effective enough to justify the costs, and has a dosage that cannot be precisely controlled.

The film is a global conversation from Iceland to Indonesia between Jeremy Irons and scientists, politicians and ordinary individuals whose health and livelihoods have been fundamentally affected by practices such as landfills and incinerators. Visually and emotionally the film is both horrific and beautiful: an interplay of human stories and ecological disruption. But it ends on a message of hope: showing how the risk to our survival can be averted through sustainable pathways that provide economic solutions while protecting our air, water and food resources.