Fissure sealing for milk molars is usually maintained until the milk teeth fall out, and for permanent molars it can be maintained as long as they do not fall out. Fossa sealing is a technique performed on children when their teeth are developing that effectively enhances the teeth’s ability to resist caries. It is like putting a protective coat on the defective teeth to protect them from food and bacterial erosion, thus enhancing the teeth’s ability to resist caries. Dentists recommend that fully erupted, deeply socketed permanent molars be socketed. Fissure sealing for milk molars is usually maintained until the child’s milk teeth fall out and the permanent teeth come in. In the case of permanent molars, the sealer can be maintained if the sealer is well retained and not dislodged during the period of time. In some people, the sealant may fall out in the middle of the procedure, and the duration of maintenance will be shortened accordingly. After sealing the fossa, the fossa should be reviewed periodically (3 months, 6 months or 1 year) to observe the retention of the sealant, and the sealant should be redone if it falls out.