So, how did we come to put fluoride in our water? Scientists eventually noticed that in some regions, people had fewer cavities than in other regions. After looking for why this was, it was discovered that those regions where people had fewer cavities had natural fluoride in the water. Doing more research, it turns out that fluoride makes teeth stronger and therefore more resistant to cavities. So, municipalities started adding fluoride to the drinking water and the rate of cavities dropped significantly. I'm 70 and have had only one cavity - which occurred when I was living overseas for four years serving in the Army.
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