Sorry, but I have no idea.
You assumed, incorrectly, that folks with dentures are the people who enjoy the soft white bread. This is a fallacy, if you have no teeth at all, maybe the white bread is a good sub. But if a person has dentures, hearty crusty breads with bite to them are preferred.
Sorry, I am a geriatric, Geriatric Nurse who wears dentures, I'm not a fan of false stereotypes towards the elderly.