his product is wonderful. I was able to remove some pesky stain in the crevices near my gums. I floss daily, and use a teeth whitener at home. However, I could never quite remove the stains that have built up in between my teeth in those hard to reach places. Using this product for the first time, the stains came off after about 5 minutes of scaling. I would suggest that you watch a few youtube videos on how to do it property, since it can damage your gums if you are not familiar with the technique.