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Is it safe to drink water that has a high level of fluoride?
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It is generally accepted that the optimal level of fluoride for drinking water is 0.7-1.2 mg/L (milligrams per liter). However, there are no specific guidelines for what levels of fluoride are considered unsafe or dangerous for consumption. The World Health Organization and the US Centers for Disease Control and Prevention recommend that people should limit their exposure to fluoride as much as possible by avoiding tap water with higher than recommended levels of fluoride.