Sources of dietary fluoride include:

• A. Water fluoridation
• B. Swallowed fluoride toothpaste (under age 3)
• C. Dietary fluoride supplements
• D. All of the above

Answer: (D)

Fluoride exposure that affects the diet comes from several routes, not just drinking water. Fluoridated water provides a swallowed dose, toothpaste that is swallowed by children adds to ingestion, and prescribed dietary fluoride supplements increase systemic fluoride as well. Because the total fluoride the body ingests is the sum of these sources, all of these contribute to dietary fluoride exposure, making all of the above the best answer. In practice, fluoride exposure is tailored to age and caries risk to avoid excessive intake, such as limiting toothpaste amount for young children and prescribing supplements only when indicated.