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The skill in using injectable toxins is to predict the way an individual's face is going to react to treatment by carefully observing all muscle movements, and ideally photographing the different facial expressions pre-treatment.
The treatment and dose can then be tailored to the individual - this is certainly not a 'painting by numbers' treatment with fixed-dose regimes.
A review at 2 weeks is essential to make any minor adjustments necessary, and if the fact that the client has had 'Botox' has been spotted by their friends, then the treatment has not been done properly.