A small amount of Botox can be placed into the muscle that creates a wrinkle. When Botox is injected into a muscle, it blocks the nerve impulse from reaching that area, and as a result, the muscle weakens. As the muscle relaxes, the wrinkles in the skin gradually soften and often disappear. When Botox is injected there is an initial minor sting for a few seconds. Once the injection is complete, there is usually no discomfort.
The effects of Botox Injections usually last three to five months, at which time another injection is required. After several treatments, the effects of Botox Cosmetic Injections may begin to last longer, sometimes up to six to eight months.