Many of the less symptomatic malocclusions in children are caused by poor oral habits. Habits such as tongue spitting, finger sucking, breathing through the mouth, and lip biting are all habits that are harmful to normal dental development. The habit of spitting out the tongue may cause the formation of prism-like gaps between the upper and lower front teeth, which can also cause malocclusion and large jaws. During the period of tooth replacement, you often use your tongue to lick the loose milk teeth that should be replaced, and when permanent teeth grow out you still have the habit of using your tongue to lick the permanent teeth. The crowns grow outward over time, resulting in gaps between the front teeth, which are not only unsightly in appearance, but also make the gaps larger and easier to embed food. Biting the lower lip, this habit will increase the pressure of the teeth toward the side of the lip, the front teeth of the upper jaw grow outward diagonally, causing the teeth to change position inward and grow, resulting in crowding. Gradually, the ground part shows the upper row of front teeth protruding forward, creating a face with curved lips. Biting and sucking fingers, this habit over time will form the upper front teeth protruding forward and the lower front teeth retracting backward, making the gap between the upper and lower teeth increase, while the tooth hall becomes higher. Long-term breathing with the mouth, both sides of the cheek muscle structure will change, the dental arch arrangement is easy to lose support, resulting in the upper dental arch narrow, the upper front teeth protrude, the lips are increasingly closed, the teeth are also increasingly protruding outward, over time the formation of the face of the “storm teeth”, very unattractive.