There are many hazards for children’s uneven teeth, which not only endanger the chewing organs, but also affect the whole body health and even the psychological health: 1. Teeth that are well aligned are easier to clean; when teeth chew food, food circulation over will produce physiological self-cleaning effect on teeth. On the contrary, if the teeth are not aligned, the self-cleaning effect will be weakened, and it is not easy to clean, so it is easy to occur caries, gingivitis and periodontitis and other diseases. 2.When the upper and lower teeth bite together, the misaligned teeth may bear the excessive or abnormal direction of the bite force, which will cause the damage to the pulp or periodontal of the misaligned teeth over time. 3, the upper and lower jaw arch relationship is abnormal, that is, the normal occlusal relationship between the cusp and fossa of the teeth is disrupted, can not exercise the grinding and cutting function well, will reduce the efficiency of chewing, which will lead to indigestion and other intestinal disorders. 4, some abnormal occlusal relationship, such as backbite, may affect the patient’s speech function, especially the pronunciation of some special lip-tooth sounds. 5.The abnormal position of teeth and jaw size and shape will affect the lip-tooth relationship, and the coordination of nose, lips and chin and the symmetry of the face will be destroyed, which will affect the aesthetic appearance. 6.Small jaw deformity will affect the width of the airway, further affecting normal breathing, or inducing snoring, etc. 7. Abnormal occlusal relationship may also affect the function of the temporomandibular joint, or induce teeth grinding, head and facial pain, migraine, tinnitus and other conditions. All of these adverse effects can potentially affect the child’s psychological health, and also affect the choice of career and planning. Therefore, if you find that your child’s teeth are not straight, you should not arbitrarily assume that there is no effect, but you should see a doctor so that your child can receive timely treatment at the right time.