Did not work for me
I really wanted to like this product given all the glowing reviews on here but it didn't work for me.  I have tried this product 1-2X daily now for the past few weeks and have not noticed any significant change.  Maybe if you have a lot of surface stains if you are a smoker or drink multiple dark-caffeinated drinks a day this will help significantly to get rid of surface stains. Since I don't have stains from being a smoker or drinking a lot of cola/coffee it didn't do much for me.  I went back to look at all the before and after photos posted on here and noticed the after photos that show a significant change have had some seriously lightening/photoshop of the photo compared to the before photo which could attribute to the significant results they want you to believe they got, who knows?  I also don't like the mess it makes of my white/beige bathroom sink every time I use it.  I don't like to spend significant time after brushing my teeth having to clean my sink.  Likely will not be purchasing again
Rating: 2 stars