what it is and how it's done?

 they hold one end of the string in one hand and the other end in their mouth

then they wrap the center with their other hand and twist a small sections near that finger

so then they have a piece of string shaped kinda like an arrow with a twisted area near the finger in the center right?

then that twisted area is layed on the sparce hairs to be removed and when they pull the other end of the string that's in their hand away it twists the twirled part tighter and that plucks the hairs out when it catches them

it get's more hairs at once, it's a more natural look, and because it's so fast it's not suppost to hurt as much or be as tramatic to your folicles

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