The possible reasons for the fissure sealing to fall off soon are improper cleaning of the tooth surface, improper drying of the tooth surface, improper early care after sealing, and poor fissure sealing materials. 1. When doing fissure sealing on the teeth, first of all, the tooth surface should be cleaned, if the tooth surface cleaning is not in place, the tooth surface residual food debris and plaque, it will lead to fissure sealing easy to fall off after the completion of the fissure sealing. 2. To do fissure sealing to keep the surface of the teeth dry, if the operation process, the surface of the teeth is not dry in place, there is saliva on the surface of the teeth, then it will lead to the fissure sealing material can not be very good with the surface of the teeth, easy to fall off the phenomenon. 3. After the fissure sealing care is not in place, just after a few days to eat too hard things, may lead to fissure sealing easy to fall off. 4. The material used to seal the fossa is not very good, resulting in a bad combination with the pressure surface, easy to fall off. There may be other reasons for the fissure sealing to fall off soon, it is recommended to go to the dental hospital in time to find out the reasons and treat and repair the symptoms.