Abstract
This is a prospective study of effect of botulinum toxin A (BOTOX) on masseteric muscle hypertrophy. Six patients (Four bilateral and two unilateral masseteric muscle hypertrophy) were evaluated. Each patient was recorded using subjective and objective scoring system one month, two months, and three months after injection of botulinum toxin A. All six patients showed remarkable improvement of facial contour for the first three months after treatment. There was no complaining of any side effect after the treatment except for one patient who experienced mild weakness on chewing for the first two weeks. This study shows that botulinum toxin A is a safe and effective method in treating masseteric muscle hypertrophy.
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