Eyelash extensions twisting can mean a few things. One is that the lashes can be too heavy. When the lashes are too heavy, they can weaken the eyelash and the eyelash simply cannot hold it so they tip over. Another reason can be that the lashes are too grown out. As the lashes start to grow out, they are not tight on the base (the root, or strongest point of the lash) which causes them to tip over.
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