Fluoride application is the clinical way to prevent baby’s tooth decay, and the commonly used fluoride agents include fluoride foam and fluoride gel, which can protect teeth and reduce the formation of tooth decay to a certain extent. After baby teeth are coated with fluoride, it is necessary to pay attention to diet, brushing, and later to strengthen the effect. 1. Diet: In order to ensure the effect of fluoride application, baby will be asked not to eat and drink within half an hour, and then gradually eat food after 4 hours. The purpose is that the matrix of the fluoride agent can form a protective layer on the tooth surface to block the plaque from attaching to the tooth surface. If you drink water or eat immediately after fluoride application, it may cause the fluoride to fall off. 2. Brushing: Avoid brushing too hard after fluoride application, otherwise the fluoride may fall off. At the same time, before the fluoride application, the baby also needs to carry out oral cleaning to ensure that the tooth surface is clean and there is no accumulation of any food residue, so that the fluoride can effectively protect the tooth surface and play its role of caries prevention; 3, later to strengthen the effect: in order to ensure the effect after the fluoride application, it is recommended that the baby should carry out fluoride treatment once every 3 months to increase the fluoride protection and better play the role of caries prevention. The effect of fluoride Once the caries is formed, it will cause damage to the hard tissue of the teeth, and the damage to the hard tissue of the teeth is irreversible, which may reduce the chewing ability of the baby, and may also cause malocclusion during the period of tooth replacement.