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The aim is to target and weaken, or relax, only those muscles around the mouth that are causing the excess retraction of the lip upon smiling, which then displays the extra gum tissue.
Assessing and knowing which muscles to treat and the dose of toxin to deliver is very important, as the last thing you want to impact on is the general movement of the mouth and lips which could affect the ability to smile all together, or cause difficulties with speech, chewing, drinking or even create a ptosis or drooping of the lips and mouth.