孩子的瘪嘴是一种不正常的病征,医学上称之为反(牙合)(俗称“地包天”),是一种牙颌畸形。在正常情况下,上、下牙齿的咬合并不是在同一平面上,应该是上面的门牙咬合在下面的门牙的外面。然而,当下面的门牙咬合在上面门牙的外面时,就称之为反(牙合)。反(牙合)的形成,有的可由遗传造成,如父母中有一方为反(牙合),就有可能 Children's deflated mouth is an abnormal symptoms, medically referred to as anti (occlusal) (commonly known as “to wrap”), is a deformity of the jaw. Under normal circumstances, the upper and lower teeth bite is not in the same plane, it should be above the incisors bite outside the incisors below. However, when the lower incisors bite outside the upper incisors, they are called anti-occlusion. Anti (occlusion) formation, and some may be caused by the genetic, such as one parent is anti-(occlusion), it is possible