Defluoridation is a prestigious gift to human beings suffering from adverse effects of high concentration of fluoride in water. Fluoride is a double edge sword. At low concentration it is cariostatic whereas at higher concentration it causes dental and skeletal fluorosis. Optimum concentration of fluoride is 1 part per million (ppm) with a range of 0.7-1.2 ppm. It prevents dental caries and helps demineralization of incipient carious lesions. It renders the bones resistant to osteoporosis. On the contrary, when the Fluoride level exceeds the normal limits, it results in various adverse...