A small amount of BOTOX® is injected into the facial muscles directly under the skin where it acts to minimise the involuntary muscle contractions by inhibiting neuromuscular signal transmission. By reducing the movement of muscles in these areas, the skin stops being creased and is allowed to recover, causing the lines to soften or even fade away. In the areas treated, the muscles are temporarily inactivated (always reversible), during which time the patient can break the subconscious habit of overusing these muscles.