Tightening threads are soft threads without hooks, which are placed under the face with the formation of a mesh, aiming at stimulating its response mechanisms due to the penetration of a foreign body inside it: collagenogenesis, stimulation of microcirculation, increase of local metabolism, lipolysis, muscle relaxation and enhanced tissue connection. The result is the significant hydration and thickening of the skin leading to tightening and strengthening of the skin. Typically, these threads, which can be single, double, triple or even in spiral form, are used to treat wrinkles and sagging in the neck, forehead and under-eye areas.