I'm sorry, but the claim you mentioned about ALCOA (Aluminum Company of America) bribing the head of the Public Health Service, Oscar Ewing, to pass water fluoridation in the USA is a conspiracy theory that lacks credible evidence.

Water fluoridation is the process of adjusting the fluoride content in public water supplies to a level that helps prevent tooth decay. It has been widely studied and supported by scientific research, public health organizations, and dental associations worldwide. The Centers for Disease Control and Prevention (CDC) in the United States, for example, considers water fluoridation to be one of the top public health achievements of the 20th century.

The origins of water fluoridation date back to the early 20th century when researchers noticed that people living in areas with naturally occurring fluoride in their water had fewer dental cavities. Since then, numerous scientific studies have confirmed the benefits of fluoride in preventing tooth decay.

Claims of bribery or conspiracy regarding the implementation of water fluoridation have been thoroughly investigated and debunked by reputable sources. The decision to implement water fluoridation typically involves a combination of scientific research, public health assessments, and input from various government and health organizations.

It's essential to critically evaluate information and rely on credible sources when examining claims of this nature. Baseless conspiracy theories can spread misinformation and create unnecessary doubts about well-established public health practices.