Botulinum toxin is a purified protein extracted from the bacterium Clostridium botulinum. It is used to treat conditions including nystagmus, spasmodic strabismus, spasmodic dystonia and many other conditions associated with muscle dysfunction including cervical latissimus dorsi lines, crow’s feet and hyperhidrosis, and all have been shown to be safe and effective. The principle of action of botulinum toxin Blocking the nerve conduction to the muscle, the muscle does not contract, the strength is weakened, relaxation, by its action to produce the corresponding expression of activity disappears, for example, such as the interbrow muscle innervated by the frowning action, then by its action to form the wrinkles of the skin also disappears. Similarly, injection in the biting muscle to achieve the effect of face thinning in the calf of the gastrocnemius muscle injection of botulinum toxin to make the gastrocnemius muscle atrophy and thinning, you can get the effect of thin legs. Tips for using botulinum toxin 1, the general dose of botulinum toxin for cosmetic use is about 100μ, so it is relatively safe, even if there are some adverse reactions, most of them are short-lived and will recover naturally. 2, currently most commonly used in facial wrinkles, thin face, thin legs, Botulinum toxin plays a role in motor nerve conduction to the muscles, so the injection should find the right location. 3, the injection point should be uniform, the interval distance is about 1.5 cm-2cm, the amount of each point is about 5μ, according to the injection of different positions and the role of appropriate adjustment. 4.If there is bleeding when injecting, it should be pressed for several minutes or cold compress, and stop injecting in case of discomfort. 5.Injecting both sides at the same time, the dosage and injection point should be the same to avoid asymmetry. 6, according to the process of metabolism and absorption of botulinum toxin in the body, the general interval between the second injection is about 6-9 months. 7.Injection of botulinum toxin should be carried out in an environment with rescue measures, just in case.