Let them know the purpose of the 999 emergency service and the role of Emergency Departments (Accident and Emergency) if they or a family member has an accident or a sudden serious illness.
Rhowch wybod iddynt beth yw diben y gwasanaeth 999 a rôl adrannau achosion brys (Damweiniau ac Achosion Brys) os ydyn nhw neu aelod o'r teulu yn cael damwain neu salwch difrifol sydyn.