Children’s fossa sealing is a technique to prevent children’s permanent teeth from decaying, according to the number of teeth to calculate a tooth fossa sealing costs about one hundred dollars, different hospitals charge differently. Children generally have eight permanent molars in the upper and lower jaws, permanent molars just erupted in the mouth, the cusp is high and deep fossa bottom, the bottom of the mineralization is imperfect, children often brush their teeth, so the fossa is a good area of caries, generally eight permanent teeth need to do fossa closure. Fissure sealing is fluoride resin coated on the bottom of the fossa, fluoride ions have the function of anti-caries, can protect the permanent molar fossa. The first permanent molar erupts at the age of six and the second at the age of twelve. When the occlusal surfaces of the teeth are fully erupted into the mouth and there is no gum cover on the surface of the teeth, the sockets can be closed. If children’s teeth caries, it is recommended to go to pediatrics or dentistry, the specific need for treatment can consult a professional doctor.