Fluoride is found on the surface of rocks. It mixes with the water which passes on these rocks. Its source is water. Fluorine is made from fluoride. About ¼ gram of it is found in one litre water.
Dose: One milligram fluorine can be taken in a day.
Precautions: It may be harmful if we take about ¼ gram to excessive quantity of it. So, fluoride mixed water is harmful.
Bad effect of fluorine: Teeth become yellow and coated by bad effecting of fluorine.
Removing bed effects of fluorine: Put the alum (fitakari) in the water to remove its bad effects.