Fluorine is one of the most important elements in the human organism, which actively takes part in the mineralization of the teeth. The deficit of fluorine in water and food is the reason for fast development of caries. Children’s primary (baby) teeth and permanent teeth’s dentin and enamel are distinguished with less density and thus are an easy target for bacteria that cause tooth decay or caries. That is why dental fluoridation therapy is one of the most important methods for caries prevention. This procedure, the usage of fluoride varnishes and liquids, strengthens the enamel and helps the teeth become more durable against microbes that cause caries.