Gold amalgams outlasted the human lifespan too. As usual, the problem is the interface: eventually, a bacterium will slip its way in between, ferment some lacto

Gold amalgams outlasted the human lifespan too. As usual, the problem is the interface: eventually, a bacterium will slip its way in between, ferment some lactose, and drop the pH, eventually dissolving away enough of the native enamel for a friend to join, and away the positive feedback loop goes.