Make an accurate preoperative evaluation: before the operation, the doctor should judge whether the age of the beauty seeker is consistent with the degree of wrinkles in various parts of the face. For example, you can ask beauty seekers to make exaggerated expressions to evaluate their skin, muscle strength, muscle size, muscle mobility, and whether the formation of wrinkles in a single part is pulled by other muscles. Then according to the results, the injection point and dosage are selected from person to person.

-Take crow's feet as an example. When removing crow's feet with botulinum toxin, because some people giggle when they laugh, they just move their mouths and eyes, so they can't see crow's feet; Some people only laugh when they squeeze their eyes slightly. When their muscles move, their eyes will droop and their eyebrows will droop. That's the real laugh. When injecting botulinum toxin into crow's feet, the beauty seeker must really laugh, otherwise the evaluation error will be caused, and the injection quantity and position will be biased and wrong.

◎ The dosage of injection depends on the situation: when removing old wrinkles with botulinum toxin, it is reported in some places abroad that 20 units of botulinum toxin will be used. But the experts in this article said that China people generally use less than 20 units, because China people's muscles are relatively not as strong as foreigners. Moreover, multiple injections will not produce drug resistance, but will make the effect more lasting, so there is no need to inject too many doses at a time for fear of drug resistance in muscles. In addition, botulinum toxin will gradually change the contraction habits of muscles, so don't worry that stopping injection for a while will deepen wrinkles.

◎ Smoothing crow's feet should be just right: foreigners use botulinum toxin to treat crow's feet, and one point will hit 4 units. Generally, one side will choose 3 injection points, and then both sides will add up to 24 units. However, we orientals pay more attention to crow's feet, and we often receive injection treatment from some beauty seekers just after a little wrinkle appears in clinic. Therefore, the dosage and depth of injection should be determined according to the situation to avoid overcorrection. If the mouth is skewed after injection, it is likely that the injection is too deep or the wrong muscle is hit.

-When injecting botulinum toxin into crow's feet, be careful not to exceed one-third of the injection, and pull out the needle immediately after injection. In addition, if the injection is too deep, this part will appear drooping.