The way hyaluronic acid works is absolutely different from botulinum toxin.
Hyaluronic acid is a substance naturally found in the dermis, but as we grow older the amount of it decreases. Hyaluronic acid used by plastic surgeons is a synthetically developed substance. It is a gel, which is injected under the wrinkle.
The substance in the organism dissociates within a year or a year and a half, while the wrinkles become smoother, the condition of the tissues improves, and the skin becomes more elastic, thus stimulating the regeneration of the connective tissue.
There is no risk of complications related to facial expression because only the facial volume is being restored and deep wrinkles are filled.