It is always good to rotate your toys periodically. Rotating toys every other week will help pattern your bird to readily accept new toys without fear, and helps them to retain interest in toys that were stored. Keep an eye on toys and check them daily to ensure they are in tact, safely attached to the cage and no loose parts. Remove the toy if your bird is eating the parts. Watch for the fraying of material or rope and cut it back immediately.
Close supervision is always highly recommended.
Remember to use the right size toy part for your bird. Never give a Parakeet toy part to a Macaw or an African Grey and visa versa. I can not express enough the enjoyment my flock has with their toy box. Oliver, my eldest Grey, had the attention span of about 10 seconds. He takes two parts at a time and tries to fit one inside the other.