Botulinum toxin is the main ingredient of face slimming injections, and the usual duration of action is 6 months, after which the maintenance time will be relatively longer because the bite muscle activity is inhibited and the recovery is slower. The duration of maintenance is related to each person’s metabolism, and has more to do with the dosage of injection and the brand of injection. The effect is not seen immediately after the injection, generally 7 days after the operation began to play a gradual effect, and the effect reaches the best state after 3 months. For patients with asymmetry between the two sides of the face caused by biting muscle, you can inject more on the asymmetrical side and less on the other side to correct the asymmetry. Of course, not everyone is suitable for face thinning injection, only for the biting muscle hypertrophy of the candidates effective, to choose the regular medical beauty places or hospitals, with licensed physicians to operate. It is not recommended for women to have face thinning injection during menstruation and pregnancy. After playing face thinning injection 4 hours should be seated to rest, avoid lying down and other sleeping positions, not vigorously massage, hot compresses and rubbing, avoid strenuous exercise, to prevent excessive diffusion of drugs in the local area, 8 hours after the water can be dipped in water, 1-2 weeks there will be a mild bite weakness. Diet, try to avoid eating nuts or harder foods.