Stannous as in tin (SnF2). Other fluoride toothpastes often use sodium fluoride or sodium monofluorophosphate. Stannous fluoride is slightly more likely to stai

Stannous as in tin (SnF2). Other fluoride toothpastes often use sodium fluoride or sodium monofluorophosphate. Stannous fluoride is slightly more likely to stain your teeth.