What is a fossa closure? There are many grooves on the “big teeth” in the mouth, these grooves are uneven, like a grinding disc, which can increase the chewing area and increase the friction, which is conducive to chewing the food fully. However, it should not be neglected that these parts are deeper, easy to accumulate caries-causing bacteria, and not easy to remove, once the bacteria invade, it can gradually damage the whole tooth and shorten the life of the tooth. Vulcanization is to use a material (synthetic organic polymer resin which is harmless to human body and can be self-consolidated) and apply it in the cross-shaped sulcus of the teeth, which can penetrate into the sulcus on the surface of the teeth in liquid state and solidify after light. It is like putting a protective coat on the teeth to keep them safe from food erosion. The left side of the tooth has been closed, the right side of the tooth is not closed before (left) after (right) comparison Children are the most important to do the gutter closure, because children are young, brush teeth than adults carefully; second, children generally like to eat sweets, soft food, sticky food, these foods are easy to stick on the teeth; third, young children just erupted teeth calcification is not complete, therefore, the teeth are more likely to be eroded bad. At what age is it appropriate for children to have their teeth closed? 6-8 years old is the most suitable age for children to have their teeth closed. This is because the child’s permanent teeth have just erupted and need to be protected with a timely sealant. The newly erupted teeth are not yet fully aligned with the occlusal surfaces of the opposite jaw, so there is no discomfort after the closure. Most children are already enrolled in school and can cooperate with the doctor. Is it painful? When having a gash closure, the tooth surface is thoroughly cleaned to remove retained food residue and bacteria by brushing with a soft toothbrush. Then the tooth is acid etched to make the surface of the sulcus microscopic pores, which is conducive to the penetration of the sealant to achieve the sealing effect, and finally blow dried thoroughly to remove the water retained in the sulcus, so as not to affect the curing of the resin and the strength of the bond with the tooth surface. Apply the sulcus sealant and finally use a medical light in the oral cavity (because this material is a light-curing substance). Medically, the oral cavity is divided into four zones: upper, lower, left and right. If the child cooperates, all four zones can be done at once, and it does not take long, only 20-30 minutes, because there is no abrasion of the dental tissue, so there is no pain, what needs the child’s cooperation is to open the mouth. Is this technology mature? Vulgarization is a method recommended by the World Health Organization to children around the world to protect their new permanent teeth, and our dental organization has also recommended this new method to children nationwide to protect their teeth. In the developed countries, the routine fossa closure for children aged 6-9 years has been done for 100 years. Therefore, the caries rate in America is only 3.3%. Can I get rid of insect tooth after the closure? Theoretically, there is still a possibility of tooth decay after the closure. Because there is a certain rate of shedding in the process of sealing, some children have a lot of saliva during the operation, which may make the coating not strong and easy to fall off. Parents should always observe their children’s teeth and see the dentist if they find any problem. It is also recommended that parents regularly check their children’s teeth in the hospital every year to prevent problems before they occur, because the earlier dental diseases are treated, the better the results. Where can I get a dental sealant? Professional dental hospitals can generally do it, and large general hospitals can also do it if the dental department has this business. Some health centers are also carrying out this activity.