The only way to do double eyelids without surgery is to bury the thread, but at present, embedding the thread to do double eyelids has a great disadvantage-that is, the effect of double eyelids will disappear after a period of time. I heard from a friend that she also buried the thread, which seems to have a good effect and is permanent. She said that she had the operation in a plastic surgery hospital. It seems that this operation is called Tian Zi Ecology. You can consult them in official website!