NRC: More DF

The 2006 NRC Review - More on dental fluorosis
© 2006 PFPC

QUOTE:

The possibility that either dental fluorosis (Chapter 4) or the delayed tooth eruption noted with high fluoride intake (Chapter 4; see also Short 1944) may be attributable at least in part to an effect of fluoride on thyroid function has not been studied. (NRC 2006, page 198)

FACT:

This statement is entirely untrue. This issue has been studied for many decades since the early 1900’s (Schuld, 2005; McKay, 1918; Wilson & De Eds, 1940; Steyn, 1964; etc.). The Review itself cites numerous studies which have found clear evidence that fluoride and thyroid hormones have "mutually interacting effects" on 'dental fluorosis' (i.e Zhao et al, 1998; Yang et al, 1994; Lin et al, 1991).

See also comment: Delayed Eruption

REFERENCES:

Lin Fa-Fu, Aihaiti, Zhao Hong-Xin, Lin Jin, Jiang Ji-Yong, Maimaiti, and Aiken The Relationship of a Low-Iodine and High-Fluoride Environment to Subclinical Cretinism in Xinjiang. Endem Dis Bull 1991;(6)62-68

McKay, FS. Progress of the year in the investigation of mottled enamel with special reference to its association with artesian water. J Natl Dental Assn 1918;5:721

Schuld A. Is Dental Fluorosis Caused By Thyroid Hormone Disturbances?
Fluoride 2005; 38(2)91-94

Steyn DG. Once More - Fluoridation. Review. University of Pretoria NUWE REEKS No.24 (1964)

Wilson RH, DeEds F.The Synergistic Action Of Thyroid On Fluoride
Toxicity. Endocrinology 1940;26:851

Yang Y, Wang X, Guo X. Effects of high iodine and high fluorine on children's intelligence and the metabolism of iodine and fluorine.
Chinese Journal of Epidemiology 15(5):296-8 (1994)

Zhao WY. A preliminary study of the interaction of iodide and fluoride in experimental iodide-goiter and fluorosis. Chinese Preventive Medicine 1988;22:146-148

Zhao W, Zhu H, Yu Z, Aoki K, Misumi J, Zhang X.Long-term Effects of Various Iodine and Fluorine Doses on the Thyroid and Fluorosis in Mice.
Endocr Regul 1998;32(2):63-70