Negative effects on oral motor function after submandibular and parotid botulinum neurotoxin A injections for drooling in children with developmental disabilities.

Aim: To evaluate negative effects on oral motor function after concurrent submandibular and parotid (four-gland) botulinum neurotoxin A (BoNT-A) injections as a treatment for paediatric drooling.

Method: This was a retrospective cohort study of 125 children (median age 7 years 7 months [interquartile range 4 years 5 months]) with developmental disabilities, including cerebral palsy, treated with four-gland injections. Most children (90.