The effects of time and sun exposure cause ageing of the skin. The most visible signs of ageing are seen on the face in the form of creases at the forehead and eyes. Muscle relaxing injections are a safe and reversible procedure that can be performed in-office. The constant contraction and relaxation of facial muscles eventually causes wrinkles to appear. When a nerve signals a muscle to contract, special chemicals are released at the end of the nerve. These chemicals bind to receptors and allow the electrical signal to pass onto the muscle resulting in muscle contraction. Muscle relaxing injections contain a chemical called Botulinum toxin type A that temporarily blocks nerve transmission. Within 2 weeks of treatment, you'll notice your skin has a naturally smooth and healthy appearance. Treatment lasts for around 3 months. However, with repeated treatments the effect lasts longer.