It is considered a safe and effective treatment used to relax the muscles that cause dynamic facial wrinkles, resulting in smoothening of the overlying skin. Treated muscles will generally regain function, hence this treatment last for a range of 4-6 months. 

Hyaluronic acid, a type of sugar (polysaccharide) that is present in body tissues, is chemically crosslinked to produce an absorbable soft tissue filler that is injected into the skin to restore volume and youth in the face with its smoothing and filling effect. This material can last from a range of 6 months to 18 months.