The casino has the right to change the dice whenever they feel like it. Usually it happens when players begin to win too much. Some casino supervisors are as superstitious as the players.
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:
They think that the dice are already old and the edges are worn down. The casino change the dice when nobody plays at this very table.
At the end or beginning of an 8 hour shift, in some casinos, either when a whole new crew of dealers comes on to the table or when the Pit Staff counts down (audits) the Bank. The dice can be changed if the layer himself requires it. But the casino is not obliged to change the dice only because the player wants it. The shooter can lose one of the dice while rolling. It's very rare that dice are actually lost.
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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