In order to protect milk teeth and young permanent teeth, and to protect the health of periodontal tissues, we should train children to develop good brushing habit from childhood. Parents can use a clean and disinfected gauze or handkerchief on their fingers to scrub the teeth of children from the beginning of tooth eruption (about half a year old) with water every morning and evening, in the process of scrubbing, the action should be light, do not rub the gums and mucous membrane. With the eruption of milk teeth, parents first brush the teeth on behalf of the child, and cultivate the child’s interest in brushing. Generally around 2.5 years old, children can brush their own teeth independently. Children should brush their teeth by the smooth brushing method and pay attention to choosing the right toothbrush according to their age. To improve the effect of brushing, children can be instructed to brush their teeth by using plaque staining tablets to stain the tartar before each brushing, and let the child see the degree and parts of his teeth dirty in front of the mirror, and pay attention to which parts should be brushed properly. In the second week, the child will check the tartar residue with plaque staining tablets after each brushing, so that the child can understand which parts are not yet brushed and which parts should be paid special attention, and let the child know the effect of his brushing, and check the effect after brushing in the fourth and fifth week. After five weeks of training, as long as parents patiently teach and supervise, and children carefully operate, your child’s oral hygiene will surely improve significantly. In addition to letting children master the correct method of brushing, they should also develop the hygienic habit of brushing their teeth once in the morning and once in the evening, for three minutes each time, and rinsing their mouth after meals.