Final answer:
B. 12.
The recommended age at which fluoride supplementation should cease is 12 years old (B).
Step-by-step explanation:
The recommended age at which fluoride supplementation should cease for children who do not live in an area with a fluoridated water source and who do not consume bottled water that contains fluoride is 12 years old (B).
Fluoride is beneficial for children under 8 years old as it helps strengthen their developing adult teeth. However, after the age of 8, the permanent teeth have already formed and supplementation may no longer be necessary.
It's important to note that community water fluoridation is recognized as the most cost-effective method of delivering fluoride to all, reducing tooth decay in children and adults. Nonetheless, excess fluoride can have negative health effects, including skeletal fluorosis, so it's always important to follow recommended guidelines.