Botulinum toxin is a substance derived from the bacterium Clostridium botulinum, one of the most potent toxins in existence. Botox injections work by blocking chemical signals from nerves that cause muscles to contract. This prevents the injected muscles from tensing up, which can relax and soften wrinkles. Botox is most commonly used to treat facial wrinkles, such as frown lines, crow's feet, and forehead lines, but it can also be used to treat other health conditions such as Migraine headaches and excessive sweating. 

The effects of Botox injections are temporary and can last anywhere from three to twelve months, depending on the area being treated. The effects may improve over the first two to three weeks as the Botox works on the muscle fibers. The dosage needed depends on the strength and size of the muscles, but a practitioner can help determine the appropriate amount for each individual.