One year after the closure of the sulcus, all the teeth are decayed, which means that the operation of the closure of the sulcus is carried out for one year and more, and all the teeth have caries. Closure of sulcus is to apply the sealing material to the sulcus point gap of the crown to prevent the occurrence of sulcus caries in young children. However, it does not mean that the occurrence of tooth decay is completely impossible after having a gully closure. If the daily dental cleaning is not in place, long-term eating a lot of sweets and other bad oral hygiene habits, or there is a problem after the closure of the sulcus, there may also be the performance of full tooth decay. 1, bad hygiene habits: the sulcus closure is only for the prevention of sulcus caries, even after doing the sulcus closure, can not achieve the effect of once and for all. If you do not pay attention to cleaning the exposed surface of teeth, the gap between adjacent teeth, or eat a lot of high sugar food, tooth decay may still continue to occur, and even the situation of full decay. Therefore, even if you have done guttering, you should pay attention to protecting your teeth, brush your teeth in the right way, clean your teeth well and avoid excessive intake of high-sugar food; 2. Especially for children, inconsistent cooperation in the closure of the gutter, some children have difficulty in cooperating with the doctor’s treatment, resulting in the operation of the gutter into the saliva, but also easy to cause the sealant to fall off. Therefore, after having the fossa filled, you should also follow up with the doctor to check the status of the fossa sealant and cooperate in time if you need to repair or redo it. If there is no timely follow-up, it may also result in sulcus decay, or even lead to full tooth decay; 3, sulcus closure only permanent teeth: posterior teeth, also known as the first and second molars in medicine, this part of the sulcus is deeper, prone to tooth decay. However, in the case of sealing, both the milk molar and permanent molar should be closed, and if the milk tooth is seriously decayed, it is more likely to cause tooth decay if only the permanent tooth is sealed. Generally speaking, it is necessary to review regularly for 3-6 months after doing the gully closure, and if there is complete tooth decay, don’t be too anxious, you can take the child to the dental hospital to determine the degree of tooth decay through the examination, and whether it is necessary to carry out root canal treatment or tooth extraction treatment. At the same time, you should actively cooperate in the treatment process so as not to affect the eruption of permanent teeth.