Warning over high fluoride content of black tea
Scientists have discovered that black tea contains far more fluoride than previously thought. Early studies suggested that black tea had 1 to 5 milligrams of fluoride per liter, but a new study by Medical College of Georgia found that the beverage can hold up to 9 milligrams of fluoride. A couple of daily cups is thought to prevent dental cavities, yet high intake or long term ingestion can lead to bone health problems. According to the study, it is safe to consume 2 to 3 milligrams of fluoride per day (through water, toothpaste and food), whereas ingesting 20 milligrams per day for more than 10 years may lead to serious bone deficiencies.