Fluoride treatment is generally recommended for children aged 3-6 years old to prevent dental caries. Usually the whole mouth fluoride application starts from about 3 years old under the guidance of professional doctors, and it is carried out every six months until about 6 years old, which can reduce the incidence of dental caries to achieve the effect of dental health care. Usually, the baby teeth of children around 3 years old have been completely grown out, and the replacement of baby teeth starts at the age of 6 years old, during which children can be treated with full-mouth fluoride by professional dentists every six months. Fluoride is an important element to maintain the normal development of teeth and bones, and fluoride treatment for the whole mouth is to fluoridate the surface of the teeth to form a protective film on the surface of the teeth to make the child’s milk teeth stronger. It also inhibits bacteria from adhering to the tooth surface and growing and reproducing to form plaque, thus preventing tooth decay. The fluoride treatment needs to be operated by a professional doctor in order to avoid the overuse of fluoride agent which leads to dental fluorosis, i.e. yellowish-brown streaks on the tooth surface and even affects the enamel structure. In addition, bad living and eating habits may cause children to suffer from tooth decay, so you should reduce the intake of sweet food, rinse your mouth in time after meals and brush your teeth in the morning and evening. Using suitable fluoride toothpaste can help reduce the occurrence of oral diseases such as tooth decay, pulpitis and periapical inflammation.