A lot more people have spanish or mandarin as their first language then english. So in terms of native language, enlish is not the most common one. Maybe it's the most common language taught in schools and so on.
Definition of immediate. 1  1a : acting or being without the intervention of another object, cause, or agency : direct the immediate cause of deathb : present to the mind independently of other states or factors immediate awarenessc : involving or derived from a single premise an immediate inference.
By definition, immediate dentures are DENTURES that are inserted IMMEDIATELY after extraction of some or many teeth. Some discomfort is to be expected from both the extraction sites and also from irritations from the dentures themselves.