Have you come across family, friends, or perhaps your own experience for cannot shut your own mouth? Following is a video from BBC about how a doctor putting the jaw of a college girl back to the place it should be.
Drop-Jaw-cure

The misaligned jaw is cured by using a bit of clinical trick using 26 pieces of wood tongue depressors and a skillful hand of the doctor is the exact prescription. Not suggested for yawning too wide during boring class, will ya? 🙂

[ Source: MedGadget ; Gizmodo ; BuzzFeed ; BBC UK Bizarre E.R Show ]