An epidemiologic study evaluates the rate of dental caries and tooth abscesses among children living in communities within a metropolitan area. Investigators discover that the rate is high among children living in an upper-middle-class community but low in children living in a community below the poverty level. The levels of trace elements in the water supplies for those communities are measured. A higher level of which of the following minerals in the water is most likely to be associated with a lower rate of dental decay among the children living in the poor community?
An epidemiologic study evaluates the rate of dental caries and tooth abscesses among children living in communities within a metropolitan area. Investigators discover that the rate is high among children living in an upper-middle-class community but low in children living in a community below the poverty level. The levels of trace elements in the water supplies for those communities are measured. A higher level of which of the following minerals in the water is most likely to be associated with a lower rate of dental decay among the children living in the poor community?
💡 Explanation
**Core Concept**
The question tests the understanding of the relationship between fluoride levels in drinking water and dental caries, a condition characterized by the demineralization of tooth enamel. Fluoride has a well-established role in preventing dental caries by promoting tooth remineralization and inhibiting acid production by bacteria.
**Why the Correct Answer is Right**
Fluoride has a unique ability to prevent dental caries by making teeth more resistant to acid attacks from plaque bacteria and sugars in the mouth. When fluoride is present in the water supply, it can be ingested by children, who then deposit it into their teeth, making them more resistant to decay. This process is known as topical fluoridation. The optimal level of fluoride in drinking water for preventing dental caries is between 0.5 and 1.0 milligrams per liter.
**Why Each Wrong Option is Incorrect**
**Option A:** Copper is an essential mineral that plays a crucial role in various bodily functions, including the immune system and connective tissue health. However, it has no established role in preventing dental caries.
**Option C:** Iodine is essential for the production of thyroid hormones, and its deficiency can lead to conditions such as goiter and cretinism. Iodine has no established role in preventing dental caries.
**Option D:** Selenium is an antioxidant mineral that plays a crucial role in protecting cells from damage. While it has various health benefits, it has no established role in preventing dental caries.
**Clinical Pearl / High-Yield Fact**
The optimal level of fluoride in drinking water is between 0.5 and 1.0 milligrams per liter, and excessive levels can lead to dental fluorosis, a condition characterized by white or yellowish spots on the teeth.
**✓ Correct Answer: B. Fluoride**
✓ Correct Answer: B. Fluoride
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