“Diastema” is a common oral malocclusion in children. Under normal circumstances, when the teeth bite together, the upper teeth are located outside of the lower teeth, wrapping around the lower teeth. In the case of “encephalitis”, the lower teeth are located outside of the upper teeth, encasing the upper teeth, hence the name “encephalitis”. Due to the abnormal relationship between the teeth and the jawbone, it can lead to a variety of problems, including bite function and aesthetics. “Is it natural? Why do moms and dads not have it and their babies develop it? A: Genetic factors, parents’ “geodynia” is likely to be passed on to their children; B: Congenital diseases, those with cleft palate will cause the upper jaw to underdevelop, resulting in “geodynia “C: systemic diseases, rickets, endocrine disorders or chronic inflammation of the tonsils may lead to; D: acquired local causes: poor feeding posture, many parents will let the baby lie flat with the bottle sucking milk, when the lower jaw needs to suck forward hard, thus causing the anterior teeth of the milk to rejoin. 1, food structure continues to refine, tooth wear is not enough, may also lead to “encrustation”; 2, spitting tongue, biting the upper lip, jaw forward and other oral habits are also easy to cause anterior teeth rebound; 3, milk teeth caries may also lead to the loss of tooth space, resulting in encrustation. Is it necessary to treat “Diastema”? “Diastema is a common oral malocclusion in children, which may occur in both the milk teeth and permanent teeth. Some people think that the problem of “overbite” only affects the aesthetics of the teeth (not excluding those who think “overbite” is more beautiful), and it is not necessary to treat it. In fact, it is not only the aesthetics that are affected, but also the jaw and muscle development, oral and facial aesthetics and psychological effects. Whenever possible, treatment should be started as early as possible to restore the normal bite of the upper and lower teeth, improve facial morphology, and promote normal jaw and facial development. Starting treatment early, the method is simple, the treatment time is shorter, and the cost is low, and good results can be achieved. A small number of severe cases with a genetic predisposition may still require follow-up treatment.