No. 1: Should I treat decayed milk teeth? It must be treated in time. Many people think that it doesn’t matter whether to treat or not because the milk teeth have to be replaced, but it is not true. The reasons are as follows: 1. Before the eruption of permanent teeth, children’s feeding and nutrition absorption depend on the milk teeth, otherwise it will affect the growth and development; 2. If the child chews unilaterally for a long time because of one side of the tooth disease, it is easy to form an asymmetrical facial shape during such a growth spurt and may lead to joint disease later; 3; 4. When the child’s health condition is not good, the infection of teeth may cause regional infection or even spread to the whole body. No. 2: Do young children need to brush their teeth too? Oral hygiene should start at an early age. Young children should also brush their teeth, starting from the time when the milk teeth erupt. Also, parents should clean the baby’s mouth and maintain hygiene even before the baby teeth come in. No. 3: What is a gum closure? What are the benefits? If you look closely, you will see many fine grooves on the occlusal surface of the posterior teeth, which are called sulci. If the sulcus is deep, it is easy to get caries, especially for children who have poor oral hygiene. In order to reduce the occurrence of sulcus caries, doctors use dental materials (often photosensitive materials) to seal the tooth sulcus, which is called sulcus closure. Closure can reduce the occurrence of caries when children have not yet developed good oral hygiene habits, but it is not a substitute for tooth brushing. 4th：When is the best time to do the closure? The milk molar is usually closed at the age of 3, the first molar is usually closed at the age of 6-7, and the second molar is usually closed at the age of 12-13. Personally, I think: the closure should be limited to children with deep pockets and poor brushing; parents should educate children to brush their teeth properly, and should not rely too much on the closure, for example, if a 12-13 year old child still has poor brushing, it is for personal reasons.