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Ask to see their medical accreditations
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Ask to see their training certificate(s) and proof of continuing education credits
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Ask what type of training they have received, specifically in botulinum toxin procedures. If they say that they trained at the local beauty school or from a friend, this is not sufficient; proper training involves an accredited programme with extensive instruction and supervised clinical experience under an experienced medical injector.
Any experienced and appropriately qualified injector will be happy to show you relevant documents at your face-to-face consultation.