Thyroid-damaging fluoride may also be harmful to teeth
A new study suggests that infants who are fed formula that is reconstituted with fluoridated water are at greater risk for developing discolored teeth, which is also known as dental fluorosis. The compound is also classified as an endocrine disruptor that can cause impaired thyroid function, according to the National Research Council.
The study by Stephen Levy, which is published in the Journal of the American Dental Association, confirms his earlier studies, which show "fluoride intakes during each of the first 4 years were individually significantly related to fluorosis on maxillary central incisors, with the first year most important," and that "infant formulas reconstituted with higher fluoride water can provide 100 to 200 times more fluoride than breast milk, or cow's milk."
Fluoride's potential to impair thyroid function can be illustrated by the fact that up until the 1970s European doctors used fluoride as a thyroid-suppressing medication for patients with hyperthyroidism (over-active thyroid), according to ThyroidAlert.org. The compound was utilized because it was found to be effective at reducing the activity of the thyroid gland - even at doses as low as 2 milligrams (mg) per day.
Today, many people living in fluoridated communities are ingesting doses of fluoride that fall within the range of doses (2 to 10 mg/day) once used by doctors to reduce thyroid activity in hyperthyroid patients.