Purchase some new ones, you will find that this helps.
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Unfortunately, all basketballs lose their grip after a while. When this happens, there is no way to "re-grip" or regain the grip of the ball. The only other option is to buy a new ball.
It may sound crazy, but hairspray works. Or mearly spit on your hand and wipe it on your shoe. Also you can wrap duck tape around your toes. Im not sure if the last one wold work.....