It depends on the water quality in your area. It doesn't matter if the water contains less fluorine. If the water itself contains a lot of fluoride, then pay attention to squeeze less fluoride toothpaste every time and don't swallow the water for brushing your teeth. If you can't find the water quality test report, you can also refer to the local people living around you about the symptoms of tetracycline teeth (dental fluorosis), that is, there are yellow spots on the teeth.

If you are an adult, it is recommended to use fluoride toothpaste and extend the brushing time appropriately, because fluoride needs time to penetrate into enamel tissue. If it is for children, be careful not to swallow it. If the local water contains a lot of fluorine, it is best to use fluoride-free toothpaste.

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Fluorine is an element, and the "fluorine" in fluoride toothpaste is inorganic fluoride. Medical research has confirmed that fluoride can reduce and prevent dental caries. The anti-caries effect of fluoride is mainly local, which is manifested in three aspects:

First, after the tooth erupts, the surface tooth tissue is not very strong, and foreign fluorine can also penetrate into the tooth tissue to make it perfect.

Secondly, fluoride can reduce the adhesion of dental plaque to tooth surface, and at the same time, it can also reduce the acid production of bacteria.

Third, there is a proper amount of fluoride in the mouth. When dental caries occur, fluoride can inhibit the demineralization process of teeth, and when the acid in the mouth is removed, fluoride can also promote the restoration of demineralized teeth. Because the process of dental caries may occur at any time, fluoride can only play a role in preventing dental caries if it often exists in the mouth.