Malala also recently had surgery to reroute a facial nerve that was damaged in the attempt on her life, leaving part the left side of her mouth listless.

CNN: STORY HIGHLIGHTS

By stretching the inside of the cheeks of several patients who have complete facial nerve palsy with a finger, while performing routine checks for ulcerations or trauma, Ms Clapham caused the paralysed facial muscles to move - something not seen before.

BBC: Facial palsy patients helped by mouth massage