Final answer:
The average over-the-counter tube of fluoride toothpaste in the US contains 1,000 ppm of fluoride.
Step-by-step explanation:
Average Over-the-Counter Tube of Fluoride Toothpaste in the US
In the United States, the average over-the-counter tube of fluoride toothpaste typically contains 1,000 to 1,100 parts per million (ppm) of fluoride. This concentration is likely to prevent tooth decay. Higher concentrations of fluoride are often found in toothpastes in European countries, such as the UK or Greece.
Answer: b. 1000