Squeezing of teeth in the center may be caused by bad habits, heredity, teething period and so on. 1. Unhealthy habits: If the patient bites his lips for a long time, sucks his fingers, or breathes with his mouth open, it may cause the teeth to tilt forward, and the teeth will grow unevenly, thus appearing to be squeezed in the middle. 2. Heredity: teeth to the center of the crowded may also be caused by heredity, the patient’s parents have obvious dental characteristics, such as individual, most of the teeth are misaligned and crowded, the children’s teeth will be affected by a certain degree of heredity. 3. Teething period: patients are also prone to crowding during the teething period, if the milk teeth are retained, it may cause permanent teeth to grow misaligned, in addition, if the milk teeth are lost early, it may also cause the front of the adjacent teeth, resulting in insufficient space for budding growth, resulting in crowding of the teeth. It is recommended that patients should pay attention to oral hygiene and sanitation, and go to the hospital for treatment if there is severe malocclusion.