If a child needs a cavity filling treatment, the cavity will usually be analyzed by taking a film to determine the depth and size of the cavity, as well as the number of cavities in the entire mouth, and then the treatment plan will be determined before the official treatment. The treatment principle of pediatric dentist is from superficial to deep and progressive. In the early stage, the child’s mouth will be cleaned first and then fluoride will be applied slowly. Once the child is able to accept the treatment, the filling treatment is then performed. The filling treatment will be performed with high-speed rotating instruments to remove the decayed area, then clean, rinse, dry and sterilize the artificial material to fill the cavity. The whole process is rather complicated, so it needs the patience of parents and the cooperation of children. If there is no acute pain, you can look at the shallow and simple cavities first to let the child have a slow adaptation process. When the child gradually gets used to it, he or she will not be afraid when coming back to treat serious teeth. In addition, a professional pediatric dentist will treat the child gently and will not cause severe discomfort and pain to the child.