Perfume refills are just as fresh as the original bottles, provided they are stored in a cool, dark place away from sunlight – as typically recommended for all fragrance juice – and handled properly. The freshness and integrity of a fragrance depend largely on how it is preserved from exposure to heat, light, and air, which can degrade the scent. If the refill bottle is well-maintained, it should deliver a scent experience perfectly comparable to the original.