The family of a four-year-old child who suffered severe brain damage after being put under general anesthesia before a dental procedure has filed a $22m civil suit against the dentist. The medical negligence lawsuit filed in Multnomah County Circuit Court alleges that the child, from Oregon, overdosed on sevoflurane, which made the heart temporarily stop beating until the child was resuscitated. The lawsuit says the procedure was done despite reservations from one of the child’s parents.