Fluoride in proper amount is known to prevent caries. It is found in fluoridated water, toothpaste, and some food.
During eating, some acid produced by the bacteria in the saliva can causes demineralization of the phosphorous and calcium components of the enamel of teeth. Fluoride slows this activity and may help in the remineralisation of the enamel of the teeth. This process can help strengthen the teeth and may prevent further demineralization. For toddlers, depending on the kind of fluoride used by the dentists, they normally need to have fluoride applications every 6 months. It is recommended that you check with your dentist to know and understand the importance of fluoride and to know the adequate amount of fluoride to take to prevent cavity.