Popular areas are unlikely places for saturation to disappear. Considering how there are more dental schools (less reputable than the ones that closed two or three decades ago) opening, it wouldn't be surprising for the number of newly graduated dentists to sooner or later surpass the number of retiring older dentists from the baby boom generation. This is just my speculation. There is still a noticeable dearth of dentists in many areas throughout the United States.
I don't understand why dentists who are approaching retirement would want to retire considering the evaporation of social security and how their bodies can still manage to work like a dentist well past their retirement age.