First of all, let’s understand the factors that make the milk teeth easy to get caries: 1, the characteristics of anatomical form of milk teeth: the neck of milk teeth is obviously narrowed, the sulcus of occlusal surface is more and deeper, and the adjacent connection between teeth is not particularly close, these characteristics are easy to make food embedding, let the plaque stay and not easy to clean; 2, the characteristics of tissue structure: the enamel and dentin of milk teeth are thinner, the mineralization degree is also lower, and the resistance to acidity is weaker. It is weaker, and the anti-caries ability is significantly lower than permanent teeth; 3, diet habit: children nowadays like foods with high sugar content, sticky and fine, such as cakes, bread, candy, milk and drinks, which are easy to adhere to the surface of teeth, leading to the reproduction of bacteria and easily lead to caries; 4, children sleep longer: in the sleep state, the saliva secretion will be reduced, and its mobility is also reduced, and the flushing and buffering effects are weakened at this time. At the same time, some antibacterial substances and lysozyme in saliva will also be reduced accordingly, which is favorable to the reproduction of bacteria; 5. Children’s brushing habits: children’s hand flexibility is obviously weaker than adults, so they will miss many tooth surfaces in the process of brushing, and at the same time, the brushing time is also very short and the number of brushing is also small, so these are easy to lead to the decay of milk teeth. For the treatment of early childhood caries, for the caries that has not formed widely or shallow cavities, medication can be used, such as surface fluoride coating; once the obvious caries is formed, it is necessary to go to the decayed dentin for filling treatment.