Nail Whitener 12ml

Does this also condition the nail? Or provide any hydration?

Do I need to bleach my nicotine stained fingernails first and then use this product. Or is this an all in one? And will it stain through again?

Does this product actually whiten the nail? If I use as directed then remove polish, will the nail be whiter? Or is it only whiter while you use it?

Can I wear it all the time just like a regular nail polish?