Fluoride toothpaste can prevent dental caries because the fluorine in fluoride toothpaste can form mineral salts with calcium and phosphorus in the dentin to enhance the resistance of teeth to caries. It also promotes the precipitation of minerals on the surface of the teeth, further mineralization of caries, thus repairing tooth enamel, so fluoride toothpaste can effectively prevent tooth decay. But toothpaste alone can not stop the occurrence of dental caries, you must pay attention to the diet, to eat less sweets, eat less too hard food, do not bite hard objects, such as beer bottle caps. But also carefully brush your teeth, maintain oral hygiene, only multi-faceted attention can really play a role in preventing tooth decay.