Which of the following is NOT a result of high iron levels in water?

High iron levels in water can lead to various issues. Staining of fixtures occurs because iron oxidation can leave reddish-brown marks on sinks, toilets, and clothes. The unpleasant taste associated with high iron levels is a common complaint, often described as metallic. Additionally, elevated iron levels can interfere with water treatment processes by promoting bacterial growth and clogging filters, necessitating additional maintenance and treatment to ensure water quality.

The assertion that high iron levels prevent tooth decay is incorrect. Instead, high levels of iron can lead to undesirable effects without providing any dental benefits. Excess iron in water does not contribute positively to oral health and is unrelated to any preventive measures for tooth decay. This option stands out because it makes a claim that is not supported by evidence regarding the effects of iron on health. Instead of prevention, high iron concentrations are typically associated with various problems that can affect water quality and safety.