The principle of contouring is very simple: if you inject something under the wrinkle, it will smooth out. Doctors began to fight wrinkles this way in the middle of the last century, but these attempts were not successful. The problem was that the injection of liquids was safe, but skin folds were smoothed for no more than a day, and the use of denser substances was accompanied by numerous side effects due to the fact that they were rejected by the body.
