Some manicures do not allow you to use them again. Due to their flexible nature, they easily get fit on your nails and looks natural and make you feel comfortable also. And when you remove them from your nails, their shape gets change and also gets distorted which prevents you to use them again. You can use them only once and needs to throw after every use as they become useless and you cannot reuse them again. If there are artificial nails that you are not using then you can either use them with the new pattern or manicure or you can even gift it to your friends.