Brushing your teeth the same night after fluoride application may affect the effect. After fluoride application, you should follow the regulations to take good care of your teeth, in addition, you need to choose a regular hospital for fluoride treatment. After applying fluoride to the teeth, in order to achieve the desired effect, it is generally recommended not to drink water for two hours, not to eat for four hours, not to brush the teeth for 12 hours, and even to brush the teeth the next day if possible. Drinking, eating or brushing ahead of time can affect the fit of the fluoride to the tooth surface and affect the protective effect of the teeth. Fluoride applied to the teeth prevents cavities and allows the teeth to act as a remineralizer, making them stronger. If parents want fluoride to be as effective as it should be in children, it is important to follow the care regimen after the fluoride is applied, such as eating and brushing at the prescribed times. Fluoride treatment needs to be done by professionals, and it is recommended that parents take their children to a regular hospital dentist when they find out that their children need fluoride.