The dice can be changed by the casino at any time. Usually it happens when players begin to win too much. Superstition is common for casino supervisors too.
The main thing here is that the players never notice that the dice have been changed.
But the dice can be changed in other situations:
The house thinks the dice edges are worn down. This usually happens when there is no action at the table.
The dice can be changed with every new shift or a crew of dealers. The dice can be changed if the layer himself requires it. Of course the casino is under no obligation to change the dice just because a player asks. One or more are lost when a shooter bounces them off of the table. But in reality it happens very seldom.
Note: All dice sets are numbered and usually have the logo of the casino and the city and state location of the casino imprinted. Dice are cancelled after use with a device that imprints a small circle in the centre on the number 4 edge.

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