Serious and correct brushing is to maintain oral hygiene clean and healthy, effective and simple measures, but due to the children’s brushing quality is difficult to ensure the good way to prevent children’s dental caries is now introduced to the fossa closed 1, fossa closed The World Health Organization recommended to the world’s children to protect the newborn permanent teeth of a method. At present, the world is widely used in the prevention of dental caries, refers to a polymer composite resin material coated in the fossa of the teeth, when these materials flow into the fossa, penetrate into the fossa after the hardening of a layer of protective barrier covering the fossa. In this way, on the one hand, the original bacteria in the fossa are cut off from the source of nutrition and gradually die, on the other hand, foreign bacteria can no longer enter the fossa of the teeth, so as to achieve the purpose of preventing caries in the fossa. The effect of fossa sealing on preventing caries The effect of fossa sealing on preventing caries in the fossa of milk molar and permanent molar is very good, and it is the most effective and economical method so far. A large number of scholars at home and abroad have shown that fossa sealing can reduce the occurrence of caries by more than 50%. There was a 20-year clinical study abroad, the results found that the group that had done fossa sealing and the group that had not done fossa sealing comparison, the rate of caries within one year reduced by 83%, within five years the rate of caries reduced by 58%. The timing of fossa sealing 1, about 6 years old children, the first permanent molar (six-year-old teeth) eruption, it is the earliest eruption of permanent teeth in the oral cavity, but also to play the function of chewing, affecting the arrangement of teeth, affecting the development of the maxillofacial extremely important four teeth (upper, lower, left, right each 1), must do fossa sealing to focus on the protection. 2, 11~13 years old children, bicuspid teeth, the second permanent molar just erupted, do the fossa closed the best results. 3, if there are conditions, 3 ~ 4-year-old children, closed molar teeth. Milk molar teeth erupt around 3 years old, 11~12 years old to replace, in the mouth to stay a long time, has an important role, should do fossa closure. The process of fossa sealing is painless and non-invasive, and takes only ten minutes before and after the procedure. Fluoride Foam Fluoride foam is the latest anti-caries product developed by the United States in the 90’s, which is a more advanced and effective anti-caries method in the world. Fluoridized foam is in the form of foam, which is easier to be absorbed by enamel and not easy to be swallowed, and will not cause nausea, vomiting and fluorosis, so it is a safe and effective method to prevent caries. Advantages of fluoride foam Compared with similar products, fluoride foam has the following advantages: a) Utilizing the smallest fluorine content to achieve maximum fluorine absorption (fluoride ion absorption rate of up to 90% or more) to produce the most safe and effective anti-caries effect. b) Simple operation. b) Simple operation. Safe and reliable, suitable for large-scale group promotion. Just squeeze the fluoride foam drug on the disposable tooth tray, wear it on the teeth and bite it for 3 minutes, take out the tooth tray and spit out the remaining foam, and keep it for 30 minutes without rinsing the mouth or eating anything. c) The method of prevention and treatment is simple, does not affect the normal teaching order of the school, and the cost is low. Fluoride foam prevention and treatment once every six months, general prevention and treatment 2-3 times, you can greatly reduce the incidence of dental caries. d) Good taste. Fluoride foam has a variety of flavors, such as apple flavor, strawberry flavor, honey flavor and so on. It is suitable for children’s taste, so the prevention and treatment is carried out in a pleasant way. Effect of fluoridated foam in preventing caries a) Group-wide reduction of caries incidence. Tests and observations have shown that the effect of fluoridated foam given twice a year to students to prevent caries is quite remarkable. It can reduce the incidence of milk caries by 50%; reduce the incidence of permanent caries by 60%. b) The number of individuals suffering from dental caries is greatly reduced. c) Symptoms of caries are controlled and weakened, and remineralization and recovery of caries are promoted.