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.
From a dealer perspective it is amazing to see that when a whole new set of dice are sent out in the middle of a hot roll, the shooter and the players almost never recognize that a new set of (5) dice have been sent out.
The casino can decide to change the dice in any other of the following situations:
They find the dice too old and the edges too worn down. They change the dice when nobody plays at the 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. At the request of the a player, especially a high roller. But you have to remember that the casino can refuse you as they are not obliged to do it. One or more are lost when a shooter bounces them off of the table.
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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