With the progress of society and the improvement of living standards, people pay more attention to oral health, and oral health has gradually been considered as a sign of human civilization. Some studies show that oral health is a mirror reflecting health and quality of life. Therefore, oral health is listed by the World Health Organization as one of the top 10 standards of human health. In the process of development of human society, beauty is the indispensable basic content of all aspects of society, and is the basis of social material life and spiritual and cultural life, while the oral and maxillofacial areas occupy an extremely important position in human aesthetics, playing a window role, and is one of the most representative features of human image. A healthy mouth has the role of chewing, pronunciation and keeping the face coordinated and beautiful. Genetic and oral diseases can lead to facial development asymmetry, maxillofacial deformities, which not only affect the facial coordination and beauty, making people look aging, but also to a certain extent will cause low self-esteem, affecting social interaction. In several cities in China, the survey statistics of individual normal showed that the prevalence of malocclusion was as low as 29.33% and as high as 48.87%. In the Shanghai study, the prevalence of malocclusion was 20.9%. This result indicates that the prevalence of malocclusion is quite high. Language is formed by the oral cavity, and teeth are the auxiliary organs of pronunciation, so to speak and sing accurately, teeth are indispensable. Teeth, tongue, lips and cheek muscles cooperate with each other to control the route and flow of airflow through the mouth, thus making different sounds. When the teeth are uneven, open, reverse or missing front teeth, the tip of the tongue loses the original pronunciation positioning mark, and there is less of a control gate in the route of airflow, so the pronunciation is not clear, inaccurate, and sounds like a wind leakage. What should I do if my child has malocclusion? Is there any way to prevent malocclusion? Children should pay attention to: correction of bad oral habits such as finger sucking; sulcus closure for newly erupted permanent molars and premolars; timely extraction of retained milk teeth; and use of gap retainers under the guidance of orthodontically qualified doctors if necessary to maintain the gap of missing teeth and facilitate the normal eruption of permanent teeth. If malocclusion has already occurred, it is best to see an orthodontist qualified in time. Adults: Go to a hospital qualified in orthodontics to receive treatment. Modern orthodontics can beautify the face of patients through effective medical technology, so that patients with malocclusion can also have a bright smile. With a healthy mouth, the smile is harmonious and beautiful.