How long does it take to make a thin face needle effective

Face thinning needle is botulinum toxin. After injection of face thinning needle, the facial contour will gradually change in about 1~2 weeks. This is caused by botulinum toxin blocking nerve function. The toxin can make masseter muscle smaller. The effect lasts about 6~8 months and disappears completely. After the effect disappears, botulinum toxin needs to be injected again.