Within the last decade, the National Research Council spoke to the effects of fluoride on the thyroid gland: “The effects of fluoride on various aspects of endocrine function should be examined, particularly with respect to a possible role in the development of several diseases or mental states in the United States. Major areas of investigation include . . . thyroid disease.”
Other altering functions from fluoride could include the parathyroid, pineal glands, and the pituitary gland.