Healthy milk teeth perform a good chewing function, help with digestion, and contribute to growth and development, and children with a mouth full of decayed teeth tend to be thin and small. Children’s milk teeth also play a pivotal role in facial aesthetics. A child with a mouth full of rotten teeth will be reluctant to smile and speak, and his or her mental health will be affected. If children have too many decayed teeth, pronunciation and speech will become a problem. In addition, the milk teeth of children also reserve space for the eruption of the permanent teeth and guide the permanent teeth to erupt in their normal position. Therefore, it is incorrect to say that “the baby teeth will be replaced sooner or later and there is no need to treat tooth decay”, which not only affects children’s chewing, beauty and pronunciation, but also affects the development of children’s teeth and facial bones, and affects children’s overall health and psychological health.