In Which Situation Is Fluoridated Drinking Water Most Likely to Result

Multiple Choice

In which situation is fluoridated drinking water most likely to result in mild fluorosis?

A) 1 ppm in a 4 year old
B) 3 ppm in a 6 year old
C) 8 ppm in a 7 year old
D) 10 ppm in an 18 year old
E) 10 ppm in an older adult