The casino has the right to change the dice whenever they feel like it. But in most cases it happens when more players begin to win more. 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. The shooter can lose one of the dice while rolling.
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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