If the child’s teeth do not grow well, then through the endogenous, such as calcium supplementation of these methods, it is impossible to make already fully erupted teeth become strong again, this time can only be through the external protection of the way to protect the teeth, as usual cell phone film. Generally for the teeth have two better protection program, one is the teeth of the fluoride coating, and another is the teeth of the fossa closed. Fluoride application can be started after 1 year of age after the eruption of milk teeth, and it is recommended to apply fluoride once every six months to one year, which should be carried out by a professional dentist for the child’s milk teeth, and after the teeth have erupted to reach the surface. It is recommended to do fissure sealing for all the back teeth, which can seal the deeper fissures and pits that correspond to the more caries-prone areas, thus being able to reduce the occurrence of caries.