I've been hanging on to these for a couple of months. Surprise, surprise! But I needed to finish my Rembrandt first. I didn't think Rembrandt was working, until I realized I just wasn't using it consistantly. I would use it every other day, then forget and use it once a week, or two days in a row. Until recently I decided to brush my teeth with my regular toothpaste, followed by Rembrandt.
Used alone, I didn't get the fresh and clean whole mouth feeling with Rembrandt. However, using it after my regular toothpaste, I saw results in two days. Seems like a lot of brushing huh? Well I have an electric toothbrush, which I think is set on a two minute timer. So I just brush my teeth for a minute with my regular toothpaste and then a minute with Rebrandt.
My teeth are not super white, I drink tea and decaf coffee pretty regularly, hence some staining. I'm not looking for gleaming bright white teeth, but I definitely want some results. So I'll use it up and see what happens!