Facial expression activities are complex and delicate. The expression muscles are composed of several muscle groups, and there is mutual coordination and antagonism between the muscle groups. The main function of Botox is to relax the target muscles. Doctors will adjust the concentration and dosage of the drug according to the condition of the facial muscles, and formulate the most suitable treatment plan for the candidates. Therefore, as long as the injection treatment is carried out in qualified regular hospitals and under the guidance of professionally trained doctors, this condition usually will not occur. What kind of adverse reactions will there be when injecting Botox for wrinkle reduction? Botulinum toxin injection for wrinkle reduction is safe and reliable, and its incidence of adverse reactions is low. Occasionally, there will be some mild localized bruising, itching or headache, but usually it lasts for a short period of time and disappears on the same day, and in rare cases, the symptoms will be eliminated after 2~3 days. In addition, due to some candidates have not adapted to the local muscles are relaxed and caused by the feeling, or may cause psychological discomfort. One person can’t use up all the injections, can I share 1 bottle of Botox with my little sister? If the dose of 1 bottle of Botox is enough for 2 people after the doctor’s assessment, then 2 people can share 1 bottle of medicine, but cross infection should be avoided when dispensing and injecting. Why do my eyebrows fly up after Botox forehead lines removal? If the injection of Botox is concentrated in the middle of the forehead muscle, and the two sides of the injection is less or not injected, it will cause the eyebrow “flying” up, then you can choose to inject Botox above the end of the eyebrow to correct the situation. How often does Botox need to be re-injected? Depending on each individual’s situation, you may choose to have a refill injection once every 4~6 months. How often can I have Botox injections again if I have developed resistance to Botox? If resistance occurs, the antibody usually lasts for more than 3 years, it is recommended to change to another type of botulinum toxin when injecting again.