stannous fluoride

noun
a white, crystalline powder, SnF 2 , slightly soluble in water: used as a source of fluorine in the prevention of dental caries, especially as a toothpaste additive.
Also called tin difluoride, tin fluoride.
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American Heritage
Medical Dictionary

stannous fluoride n.
A preparation of stannous tin and fluoride used to fluoridate toothpaste and other dental preparations.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
Many toothpastes have stannous fluoride, a compound of tin.
Some toothpastes and other dental products contain stannous fluoride, a tin containing compound.
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