Generally speaking, it takes effect 5 ~ 7 days after injection, because botulinum toxin has begun to play its role, and the initial effect can be seen in 1 ~ 2 weeks, because muscles have begun to contract, and the effect is gradually obvious. The effect is more obvious after two to three months, because the muscles have basically adapted to the contraction state and the effect is more stable.

If you want to achieve better results, you usually need to inject two or three times, because at this time, the muscles have adapted to the role of botulinum toxin and need to be injected again to maintain the effect.