The characteristics of infant caries: the age of onset is small, the number of teeth involved is large, the scope of caries is wide, the lesion is serious, the progress is rapid, the early involvement of pulp and periapical tissue; uncontrolled caries eventually leads to the crown and root of the milk tooth, and even the infection of the apical tissue, which affects the development of permanent tooth embryo and the chewing function of children; serious caries leads to painful eating, affects the intake of nutrients of children, and can lead to low weight and developmental retardation; open cavity and root can form chronic foci, jaw and face infection, bacterial endocarditis, chronic nephritis and other systemic diseases The open cavities and root remnants can form chronic lesions and cause fever, maxillofacial infection, bacterial endocarditis, rheumatism, chronic nephritis and other systemic diseases; children’s sleep can be affected by toothache, and research shows that sleep disorders can affect the production of glucocorticoid hormone and interrupt children’s growth; the decay and loss of the front teeth can also affect children’s pronunciation, social interaction and normal psychological development.