Which procedure entails the use of specially designed products that keep natural eyelashes curled for long periods of time?

The procedure that involves the use of specially designed products to maintain the curl of natural eyelashes for an extended duration is known as permanent eyelash lifting. This treatment utilizes a specific solution to gently reshape the natural lashes, providing a long-lasting curl without the need for daily curling tools. The effect can last several weeks, typically up to 6-8 weeks, as it works with the natural lash cycle.

In contrast, eyelash tinting is focused on coloring the lashes for added definition and does not involve changing their shape or curl. Eyelash extensions involve the application of synthetic fibers to enhance length and volume but do not involve curling the natural lashes. Eyelash curling usually refers to the process of temporarily curling lashes using a manual eyelash curler, which does not offer a prolonged effect like the permanent method.