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Dr. Eccleston also raises this important point of safety; “From a practical point of view, cold sores are usually found in the mouth area.
Using a powerful muscle relaxing drug in this area has the potential side effect of weakening the muscles round the lips, potentially leading to drooling, difficulty enunciating certain sounds such as 'p' and 'b', and problems with lip pursing and using a straw to drink with.
All these are well known side effects when botulinum toxins are used in the mouth area in too high a dose or by an inexperienced practitioner.”