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The researchers conducted the experiment in a village of Narketpally Mandal by soaking 75 mg of Holy Basil leaves in 100ml of water that had over 7 parts per million of fluoride. After soaking the leaves in the water for a mere 8 hours, the fluoride was reduced to just 1.1 parts per million. The World Health Organization says that ‘safe’ levels of fluoride in water are no higher than 1 part per million.