This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Dental
For maximum benefit, flouride intake should start at: 
Select and explain. 
A. Birth, B. 2 years, C. 6 years, D. 10 years
A: Birth
Answer: A: Birth 
Explanation: Early start is required to derive maximum benefits.
Ideally, fluoride supplementation should begin shortly after birth and continue through at least age 13.

DHHS Publication No. (NIH). 1981