Double eyelids can be turned into single eyelids by makeup artists, which requires some delicate steps and skills. Here are some methods that may be useful:

Use eye shadow and eyeliner: applying dark eye shadow above the fold line of double eyelids can reduce the edema of eyelids. Then fill the broken line with eyeliner, and then use a small brush to stun the eyeliner, which looks more natural.

Use adhesive tape: cut the adhesive tape into narrow strips and stick it above the fold line of double eyelids. This can be attached to the eyelid and looks more like a single eyelid.

Use concealer: Apply some concealer between the adhesive tape and eyeliner to further fade the traces of broken lines.

Practice skills: It takes some practice to master this skill, so it is suggested to practice more and try different methods to find the one that suits you best.

It should be noted that these methods are only temporary and the cosmetic effect will not last long. If you want to permanently change the shape of your eyelids, you may need to consider plastic surgery. However, plastic surgery also has certain risks and side effects, which need to be fully understood and consulted before making a decision.

In short, double eyelids can be turned into single eyelids by makeup artists, but this is only a temporary effect. If you want to permanently change the shape of your eyelids, you need to carefully consider the risks and side effects of plastic surgery.