人体的舌下正中与口底之间,有一条纵行的系带,叫舌系带,可牵制舌的运动。舌系带过短时,则限制舌尖的正常运动,使舌尖不能伸出口外,或不能上卷抵到上腭,所以说话时个别字发音不清。婴幼儿舌系带过短,哺乳亦困难。成人舌系带过短,会影响假牙的固位。以上情况须进行手术,以延长舌 The human body between the middle of the tongue and the bottom of the mouth, there is a longitudinal lace, called the tongue lace, tongue can be involved in the movement. Tongue is too short, it limits the normal movement of the tongue, so that the tongue can not stretch out of the mouth, or can not roll up to the palate, so when speaking individual words unclear. Tongue and infant tongue too short, breast-feeding is also difficult. Adult tongue lacing is too short, will affect the denture retention. The above situation must be surgery to extend the tongue