Generally, after injecting botulinum toxin, you can see the face-lifting effect in about 2 weeks, and then choose to continue the needle according to the beauty lover's own situation. After two or three months, the face-lifting effect reached its peak. Botox can make the masseter muscle contract by about 30%, and the effect can last for about half a year at the longest. If beauty lovers want to delay the recovery of masseter muscles, they should eat less hard food and avoid frequent chewing exercises for a long time (such as chewing gum and hitting melon seeds).