Botulinum toxin is also known as botulinum toxin type A or botulinum toxin, clinically used botulinum toxin is the inactivated botulinum toxin, which has cosmetic effect. As an intramuscular injection, Botox has no significant side effects and has more advantages than traditional surgical methods, but there are also some risks, as follows: 1, subcutaneous bruising: no special treatment is needed, and it can subside in 3-7 days; 2, chewing weakness: Botox acts on the neuromuscular junction, preventing the release of acetylcholine, making the muscles flaccid, and the muscles can be recovered in a week or so; 3, skin Unevenness: improper operation techniques lead to uneven injection of botulinum toxin, resulting in unevenness, generally within one month can be self-recovery; 4, facial asymmetry: injection of botulinum toxin should be assessed before the candidate to rule out asymmetry due to their own eating habits, chewing habits; 5, local skin allergic reactions, such as allergic masses, swelling, itching of the skin, anaphylactic shock, etc.; 6, facial nerve palsy; 7 , Cheek depression: due to excessive atrophy of biting muscle close to the cheek, resulting in depression in the center and making people look old. After Botox injection into the biting muscle, the effect usually lasts for about 6-8 months, and the biting muscle will gradually recover after the effect is lost. However, the effect lasts longer and longer after several injections, and it usually lasts for about a year after 3-4 injections, and a few people can even maintain the effect without injections in the future.