“…Initially, these methods were developed to treat facial palsy and not to ameliorate synkinesis or hyperkinesis. For many years, botulinum toxin (BT) chemical neurectomy was considered a good approach in treating these conditions 2, 4, 5. BT is a protein derived from a bacterium ( Clostridium botulinum ), and is present in seven serologic types, including A, B, C, D, E, F, and G 6–8.…”