Wrinkles are actually creases that have been worn into the skin by making the same expression thousands of times. These "expression lines", often called frown lines or crow's feet (smile lines around the eyes) or bunny lines (scrunch lines around the nose) or forehead lines (horizontal lines on the forehead), are due to the contraction of a muscle under the skin in that area. BOTOX is a purified protein produced by the anaerobic bacterium, clostridium botulinum. It is a neuromodulator which acts on the neuro-muscular junction and reduces muscle contraction. BOTOX when injected into the muscle relaxes the contracted muscle. BOTOX acts by cleaving a particular protein at various locations, thereby preventing the fusion of acetylcholine vesicles with the cell membranes.
Thus, it blocks the nerves from releasing acetylcholine .As a result, the muscle spasms are greatly reduced thereby prevents formation of facial lines. Your can notice improvement within a couple of days and it lasts up to 4 months. However, results may vary from person to person.