If fluoride concentration of community water is___________ppm, no need of any flouride supplement at any stage.: (A) >1 ppm, (B) >0.7 ppm, (C) >2 ppm, (D) >1.5 ppm
Answer is B. Supplemental fluoride depends on the age of child and F- level in water.
Below 4 years, fluoridated dentifrices are not recommended
Below 2 years, F- tablets are not recommended.
Below 6 years, F- mouthwash is not recommended.
If F- concentration of community water is >0.7 ppm, no need of any F- supplement at any age.

Essentials of preventive and community dentistry 
Soben Peter 
5th edition