1. Evolutionary factors: the long human evolutionary process, degradation of the human body in many organs. Jaw mouth in the facial system, this degenerative narrowing phenomenon is also very obvious. Studies have shown that the stomatognathic organs of various components of degradation narrowed the existence of the imbalances that masticatory muscle degradation is most obvious, jaw, followed by the degradation of the teeth is the most obvious. The relatively small alveolar bone will not be able to accommodate relatively large teeth, leading to crowded teeth missing.
2. Environmental factors: environmental factors are numerous and complex is the main cause dentition. Important: the food is too small due to the improved quality of life, people's food is more sophisticated, the development of young people and children, too soft, fine food masticatory function can not be brought into full play, the alveolar bone Debu enough stimulation to dental equipment maxillary growth restricted, causing the teeth crowded; bad habits in childhood to develop the sucking means, licking tongue, the Shenshe Yaoxia Chun and mouth breathing habits such as not timely corrected, then normal eruption of the teeth and their position arranged to have a negative impact caused by dentition; replace obstacles deciduous teeth prematurely lost or fails to drop the primary and permanent teeth replace the obstacles are caused by inherited the eruption of permanent teeth dislocation, resulting in the dentition.
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