Bryson reveals a labyrinth of connecting conspiracies buried within by the military, industry scientists and public health officials who suspiciously rallied to cover key information about fluoride's potential for human harm. Bryson shows us how it is not only fluoride's use in dentistry which is poisoning the public, but its presence in air pollution damagies our central nervous systems and possibly causes a host of illnesses, including arthritis, cancer and Alzheimer's. A disturbing yet gripping read which instills a dark sense of doubt in any reader.