What is the fluoride concentration in toothpaste?

• A. 1000 mg/L
• B. 226 mg/L
• C. 0.7 mg/L
• D. 0.7 ppm

Answer: (A)

Fluoride toothpaste is formulated with about 1000 mg of fluoride per liter of paste, i.e., roughly 1000 ppm. This level provides enough fluoride to promote remineralization and help prevent decay when brushing, while staying within safe use limits for typical amounts people spit out after brushing. The other two values (around 226 mg/L and 0.7 mg/L or 0.7 ppm) are far lower and resemble fluoride levels used for drinking water rather than toothpaste, which would not deliver as effective a anticariogenic dose in the small amount of paste used during brushing. So, the 1000 mg/L option best matches standard toothpaste formulations.