Botulinum toxin A for the treatment of first bite syndrome-a systematic review.

Background: First bite syndrome (FBS) is a rare post-surgical complication resulting in peri-parotid pain after the first bite of meals. Intra-parotid Botulinum toxin A may offer relief for these symptoms. There is no consensus on the optimal dosage, timing to symptom improvement, need for repeat injections, and safety of this treatment.