Children’s teeth are not aligned with the following hazards: 1, affecting aesthetics: due to the usual open-mouth speech and smile, will be the first time to see the teeth, so the teeth are not aligned with the first impact is the problem of aesthetics; 2, self-cleaning ability is poor: local self-cleaning ability is poor, such as brushing the teeth brush is not clean, which will lead to local dental caries; 3, affecting the occlusion: the teeth are not aligned with the problem of the impact of the occlusion, which causes occlusal function 4, affect eating: bad bite will affect eating, resulting in chewing food when chewing the degree of food is poor, thus affecting the whole body’s digestion and absorption, resulting in the impact of growth and development; 5, affect the physical and mental development: dental irregularities will cause the overall aesthetic, which will affect the physical and mental development of children.