So far so good
I have been using this 2x/day for 5 days. There was no immediate difference I noticed, but now 5 days in I can tell some of my teeth are whiter. There is still some staining, but I feel with another week, maybe two of consistent use there will be minimal to hopefully no staining left. I brush my teeth with regular toothpaste first then use this.
Rating: 4 stars