"It's just like the chlorine in drinking water. In the right concentration it is protective because it purifies the water, but in a certain concentration chlorine gas has been used in wars because it's deadly." A character in the 1964 movie Dr. Strangelove believed communists were adding fluoride to American water and called it the “the most monstrously conceived and dangerous communist plot” they’ve ever had to face. The movie, which satirizes the Cold War, pokes fun at the thought of water fluoridation being used as a weapon of war.