The most suitable age for children to have their sockets closed is when the permanent teeth erupt at the age of 6. But each child erupts at a different time, parents look at the 6th tooth, that is, there were 20 milk teeth in the mouth, to be erupted to the 6th tooth, which is the earliest eruption of a permanent tooth. At this time, it is recommended that the child be closed in time. In addition, cooperative children can also have their posterior molars done, and they can be done in the hospital at the age of 3-4 after eruption. At the age of 12, the seventh tooth will erupt, and the seventh tooth is also a tooth with deep sockets and prone to caries, so the child should have the seventh tooth done at the hospital in time. During the period of tooth replacement, the lateral incisors are bicuspids, and the 4th and 5th teeth are counted from inside the mouth, i.e. the teeth in the middle of the lower side. Because the closure is extremely economical, a few tens of dollars for one tooth can prevent the caries very effectively. However, it does not mean that the teeth will not be bad if the sulcus is closed, it is necessary to review regularly after the closure, the sealant is easy to fall off, in addition, the closure only prevents the jaw surface hole, not the adjacent surface hole, do not think that the teeth will not be bad if the teeth are closed.