The main reason why double eyelids fall off or disappear is that the double eyelids are buried, and the thread that we buried is the one that hangs on the eyelid is loosened, which leads to the loosening of the double eyelids and the disappearance of the double eyelids. Because the principle of double eyelid is through our eyelid or levator tendon membrane, and our skin dermis between the formation of adhesion, in this case can form double eyelid, if the buried line of this line to the eyelid and the skin between the adhesion broken, and then our double eyelid naturally disappeared, so the buried line double eyelid, in the buried line, the line must be firmly hung eyelid, can not be hung too shallow, if too shallow, it is very easy to have a double eyelid, the eyelid will disappear. If it is too shallow, it will easily come loose, resulting in the disappearance of the double eyelids, asymmetry between the two sides or falling off after the operation.