Sodium Fluorideis a colorless crystalline salt of sodium (NaF) used in fluoridation of water and to prevent tooth decay.  It also may be effective in the treatment of osteoporosis.  Sodium Flouride is used in toothpaste.

References:
http://www.webelements.com/webelements/compounds/text/Na/F1Na1-7681494.htm
http://www.vitacost.com/science/hn/Drug/Sodium_Fluoride.htm
http://www.walgreens.com/store/product.jhtml?CATID=100212&id=prod357307&skuid=sku357308&navAction=jump&navCount=1
 

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