http://www.fluoridealert.org/health/teeth/caries/who-dmft.htmlIn...

http://www.fluoridealert.org/health/teeth/caries/who-dmft.html

In the second half of the 20th century, a steep decline in tooth decay occurred among children in the United States. Proponents of water fluoridation have long claimed that this reduction in tooth decay is primarily the result of adding fluoride to water.

When the Centers for Disease Control (CDC) nominated water fluoridation as one of the top 10 public health achievements of the 20th century, it published a graph (see Figure 1), which showed the reduction of cavities in US children coupled with the increase in water systems that have been fluoridated since the 1960's. The CDC referred to the graph with the statement:

"as a result [of water fluoridation], dental caries declined precipitously during the second half of the 20th century."

However, what the CDC failed to mention is that similar declines in tooth decay have occurred in virtually every western country, most of which do not fluoridate water (see Figure 2).