Operation on mouth (procedure)

• Mouth operation
• Operation on mouth
• Operative procedure on mouth region

• Operation on digestive tract (procedure) and Role group (attribute) some (
      Method (attribute) some Surgical action (qualifier value) and
      Procedure site (attribute) some Mouth region structure (body structure))

• Operative procedure on head (procedure)
• Procedure on mouth (procedure)
• Upper digestive tract operation (procedure)