You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is Fluoride content in drinking water normally safe is and explain in detail?
The recommended level if fluoride in drinking water in India is accepted as '0.5-0.8 mg/litre' (0.5-0.8 ppm) In temperature countries where water intake is low, the optimum level of fluoride in drinking water is accepted as 1-2 mg/litre 'Fluorine is a double edged sword' : Inadequate intake is associated with 'dental caries' whereas excess intake with 'dental and skeletal fluorosis' Ref: Park 25th edition Pgno : 663