For over 50 years fluoride has been added to the water of many countries to help reduce tooth decay. Many people claim that fluoride has many negative effects such as cancer and even the lowering of IQ. Many tests have been done by organizations proving fluoride to be harmful to humans.

Why fluoride is still being added to water is up for debate. On the one hand you have people arguing that it is good for our teeth, which is why we also find it in toothpaste. On the other hand you have people who acknowledge that while there may be positive effects of fluoride on our teeth, the negative effects of fluoride far outweigh the positives. There is also evidence to support that fluoride is not at all related to the prevention of tooth decay.