Comments and advertising about this product give the impression that it will actually whiten that is bleach your nails. It will not. This is important to understand. The formula has a slight whitish cast to it, meaning that when it goes on it lightens your nails slightly, simply by camoflaging/covering. In one coat the yellowing left by previous nail products is perhaps 30-40% lessened. However, when the product is removed the nails have the same degree of yellowing as when you began. So there is no bleaching effect.All that aside, the forumula dries quickly, has a nice glossy finish and is a pleasantly neutral, very subtle colour. It's worth having for those features if you can tolerate the formaldehyde, which I can't. After a short time formulae like this weaken my nails, causing them to soften and peel dreadfully.