Truth:? The statement that "fluoride toothpaste causes cancer" may be a misunderstanding and misinformation of "fluoride causes cancer".
In 2008, the United States reprinted an article, dangerous fluoride toothpaste. The problem of excessive fluoride intake is discussed, which is related to the background of fluoride addition in drinking water in many parts of the United States.
Among them, the content of "excessive intake of fluoride leads to nervous system diseases, endocrine diseases and even cancer" is controversial, but it has become "fluoride toothpaste causes cancer" without mentioning a word since then.
In 20110, the United States published a document entitled "Evidence of carcinogenicity of fluoride and its salts". After analysis, it is concluded that fluoride is carcinogenic. In the end, fluoride was not added to the list of carcinogens.
In fact, as early as 1977, the World Health Organization was concerned about whether cancer mortality was related to drinking water fluorination. Since then, a large number of epidemiological studies have been carried out in various countries, and most of the results are not internally related; There are many reports in this field in China, and no correlation has been found. Animal experiments have not provided strong evidence to explain the relationship between fluoride and tumorigenesis.
So there is no conclusive evidence that fluoride can cause cancer, and the statement that fluoride toothpaste causes cancer is a controversial issue.
Why should fluoride be added to toothpaste? Prevent tooth decay!
When brushing teeth, fluoride in fluoride toothpaste is released and forms a fluoride mineralization system with mineral salts such as calcium and phosphorus in the paste.
On the one hand, fluoride ions can replace hydroxyl groups in dental tissue mineral salts to form fluoride-containing mineral salts, thus enhancing the ability to resist dental caries; On the one hand, fluoride can promote the deposition of minerals on the tooth surface, remineralize early dental caries and repair enamel.
Adding fluoride to toothpaste can well meet the conditions of local and repeated use, and it is the first choice to effectively maintain the appropriate fluoride concentration in the mouth.
At present, most toothpastes on the market contain fluoride, and all toothpastes approved by the American Dental Association contain fluoride. The Oral Health Guide for China Residents also thinks that brushing teeth with fluoride toothpaste is a safe and effective measure to prevent dental caries, and advocates the use of fluoride toothpaste to prevent dental caries, which is especially suitable for children and the elderly who are prone to dental caries.
Fluoride toothpaste is safe and effective.
Just like eating too much salt can lead to poisoning, any substance can be poisoned if ingested too much, and fluoride toothpaste is no exception. However, fluoride toothpaste is safe if used normally.
For an adult weighing 60 kg, the recommended daily fluoride intake should be less than 4.2 mg. Children under 6 years old have poor swallowing reflex and are easy to swallow toothpaste. Care should be taken to prevent excessive intake of fluoride. Therefore, children should use children's toothpaste with less fluoride content (generally 250~500 mg/kg) to avoid swallowing.
Fluoride toothpaste is not suitable for everyone.
In some areas of our country, such as Chaoshan area, the groundwater itself contains high fluorine content. Local residents drink these water without fluoride removal and consume excessive fluorine for a long time, which leads to chronic poisoning. Mild poisoning can cause dental fluorosis, and a few severe poisoning can lead to skeletal fluorosis. The tooth surface of patients with dental fluorosis will appear chalk spots or even punctate pits, which will turn yellow-brown due to dentin exposure and coloring.
Conclusion: The rumor is shattered. ? Fluorine toothpaste does not cause cancer. "Water with high fluorine content can cause yellow teeth" actually refers to dental fluorosis caused by long-term intake of excessive fluorine. Fluoride toothpaste plays an important role in preventing caries, and it is safe and harmless when used normally, but it is not suitable to use fluoride toothpaste in areas with high fluoride drinking water. Everyone should pay attention to the intake when using fluoride toothpaste every day.
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