The principle of the facial slimming injection is based on the injection of medication to make the muscle shrink. The shrinkage of the muscle is not an overnight achievement, that is, the initial level of muscle shrinkage is relatively slow, and the patient may not be able to observe it. Only when the shrinkage is relatively significant can one see that they have indeed become slimmer. About 10-14 days later, one can feel the slimming or the softening of the masseter muscle when touched. Around 1.5-2 months, the slimming effect will be most significant, and then as the effect of the medication fades, the shape of the masseter muscle will gradually return to the original shape. The second injection does not need to wait until the volume of the masseter muscle is completely restored; the best time for the second injection is 4-6 months after the first injection. Since the masseter muscle is only one of the four masticatory muscles, its shrinkage will not affect eating.

During lactation, due to the stimulation of growth hormone, the breast grows and increases. After weaning, it will shrink relatively. If it is smaller than before lactation, partial heat application, electric heat, and massage can be used to promote blood circulation, which can generally be slowly restored. Additionally, one can eat some breast-enhancing and beautifying foods, such as papaya and rhizoma pueraria soup. If it is the same as before lactation, this method can also promote breast enhancement and beautification, but the effect may not reach satisfactory standards, and breast augmentation surgery can be considered, such as autologous fat filling for breast augmentation, which has a small possibility of rejection because autologous fat can be absorbed and digested, so it requires multiple injections, and the cost is relatively high. Implant breast augmentation may cause rejection, but generally does not require multiple surgical treatments, as it can be formed in one session.

The facial slimming injection is actually an injection of botulinum toxin, which has the effect of inhibiting the transmission of signals between muscles and nerves. For example, if the muscle loses the control of nerve signals, it will appear denervation atrophy, that is, if the masseter muscle loses the control of the nerve, the masseter muscle will appear atrophy, volume shrinkage, and thus achieve the goal of slimming the face.

Generally, almost 100% of patients who receive a facial slimming injection show efficacy, but the size of the change depends on the original volume of the masseter muscle. Patients with larger masseter muscles may experience more significant effects. Additionally, the amount of the injection also matters, as the efficacy of slimming is also related to the harmony of the position. Therefore, it is necessary to find qualified doctors and organizations to perform the injection. Naturally, not the entire face can be slimmed with the facial slimming injection, as the masseter muscle only exists around the angle of the mandible. That is to say, the effect of the facial slimming injection is only localized, and not the entire face can achieve the slimming effect.