While they don't add fluoride, the natural levels in German tap water can reach 0.3 mg/L. Compared to the US recommended level of 0.7 mg/L in fluoridated water,

While they don't add fluoride, the natural levels in German tap water can reach 0.3 mg/L. Compared to the US recommended level of 0.7 mg/L in fluoridated water, that's not an insignificant amount.