Because the tooth fairy takes the teeth to protect the children from a kind of contagious magic where an evil Magic user curses the teeth, then the child is cursed; but once people are dead, they’re gone and what’s left? It’s just a bag of bones; there’s nothing local on this plane of existence to curse.
Curses do not cross the black sand. That is all.
It remains sad that in the world with enough artificial nitrate fertiliser to produce enough food for everyone in abundance and enough food in abundance to feed everyone in the west companies are still putting perfectly edible food into dumpsters and then covering them in motor oil to prevent freegans and dumpster divers while elsewere, famine still happens.
Those shareholders? Dentists. No love lost between them and the gamers.