<qa>  What is anesthesia safer than mask?As a result of studies regarding the provision of an airway which is less invasive than intubation but safer than mask to maintain patency of airway after anesthesia induction in brief surgical interventions, supraglottic airway devices have been introduced into practice. They are inserted to glottic entry via the oral route and can be used in emergent conditions where tracheal intubation and mask anesthesia are challenging. 