Nano scarless double eyelid, that is, buried double eyelid, although it can improve the situation of the human eye, so that the eyes look better, but there are also certain hazards, as follows: 1, this way has certain limitations, if the eye skin conditions are not ideal, such as swollen eyes, thicker skin, is not suitable for this way; 2, some people choose irregular small beauty institutions, sterilization measures and operating techniques 3. Although the recovery time is faster, the effect is not long-lasting, and the loosening of the thread is likely to occur due to eye movements over time; 4. The dressing on the eye can be removed 1-2 days after surgery. If there is blood scab or secretion on the wound, sterile saline or medical alcohol can be used to wipe it; 5. Surgery usually results in a shallow and narrow upper lid crease, and if the operator’s skills are not good, the upper lid crease can easily disappear, making it easier for the thread to loosen.