The main component of face slimming injection is botulinum toxin. Botox injection into the facial bite muscle can block the connection between the nerve and muscle, so that the signal of the central nervous system can not be conveyed to the muscle, the loss of dominance of the muscle, so that the muscle of the bite muscle atrophy, gradually make the face thinner. If the ingredients of botulinum toxin, production process qualified, doctor injection technology professional, generally no side effects, otherwise it may lead to the following side effects: 1, facial depression: the injection point of the slimming needle on the side, after the atrophy of the bite muscle, the articulation of the face depression, can promote local blood circulation through hot compresses, exercise to accelerate metabolism, but also chew hard food to speed up the recovery of the bite muscle, generally in about 4-6 months Can basically recover; 2, frog cheek deformity: if the edema type frog cheek deformity, can be immediately after surgery ice 15 minutes, the symptoms can be relieved, 3-7 days later can be healed; if the hematoma type frog cheek deformity, generally no treatment, about a month symptoms can subside; 3, infection: due to improper aseptic operation or the existence of infection in the face of the candidate himself, the need for timely treatment to the regular hospital. Therefore, when injecting facial slimming needles, candidates must choose a hospital or institution with medical cosmetic qualifications, by professional doctors for injection, choose the national certified products for injection, in order to protect the safety and effectiveness of injection.