First, what is a face-slimming injection? Face slimming injection, medically known as botulinum toxin, is a drug that acts on cholinergic motor nerve endings. It blocks the signal of the nerve to let the muscles contract, so that the muscles are inactive for a long time. Just like bodybuilders, daily exercise muscles, muscles become fat and robust. On the other hand, those who do not exercise for a long period of time will inevitably have slim and small muscles. By injecting into the biting muscle, so that the biting muscle can not exercise for a long time, the muscle size becomes smaller, the face will also change from big to small. Second, how long can the face slimming injection last? After the first injection of face-slimming needle, usually in about 10 days can feel the face began to become smaller, three months or so the effect of the drug gradually disappeared, the bite muscle volume gradually recovered. If you feel that after the face is small is not conducive to the image of the face, not the result you want, do not deal with it, so that the face to restore the previous contour, which is a major advantage of the slimming injection, reversible, unlike the surgery can not be restored to its original state. At this point, if you feel that the facial image is helped after the face is smaller and you wish to maintain it, you can continue to inject the face slimming injection. Once every three months for about five injections, the vast majority of people will be able to stabilize at this result without the need for further injections. There is a certain limit when the size of the bite muscle is reduced, and the injection after the second time lies in the maintenance, and generally there will be no further face slimming effect. Third, how is the effect of face slimming injection? Some people injecting face slimming injection effect is very good, some is not, this is because of the difference in the thickness of the bite muscle. The thicker the bite muscle, the more significant the effect. If you want to know how effective your face injection is, you can take the following three methods: one is to clench your teeth and estimate the thickness and volume of the biting muscle, which is not very accurate. The other is to use ultrasound to measure the thickness of the bite, this method is troublesome and requires an ultrasound. Another method is to use an injection needle directly into the bite muscle, just like a needle, simple and accurate. As the biting muscle certainly exists, only the thickness is different, the injection of thin face injection will be more or less some face thinning effect, the thicker the biting muscle, the more obvious the effect. Fourth, what are the complications of face slimming injection? If the injection is improper, there are some complications. We already know that botulinum toxin blocks signaling between neuromuscles, and if it blocks neuromuscular conduction that shouldn’t be blocked, it can cause problems. If the conduction goes to the cheeks, there can be cheek hollowing. If the conduction goes to the neck, there is a possibility of difficulty swallowing, etc., all of which have occurred and been reported clinically. However, these complications will disappear on their own as the effect of the medicine wears off. V. How to prevent the complications of face slimming injection? Complications of face slimming injection are mainly due to the fact that the drug conducts to the place where it should not be blocked. The first problem is the botulinum toxin of non-standard manufacturers, the dose of these products is not standardized, the drug dispersion range is wide, and the range of action can not be controlled, which is the most common culprit. In second place are injection problems, where the range of injection is outside the norm, and these too often occur with doctors who are not formally trained. Third is the dilution of the drug, where too much diluted water is used for the same dose, resulting in a wide range of penetration to the outside.