Honest review: so this stuff works- I can tell ... [SEP] Honest review: so this stuff works- I can tell you that much. BUT I think it only works for surface stains ( from coffee, wine and other drinks). I did see a noticeable difference after the first use. Brush gently with a SOFT toothbrush. I made the mistake of using a medium toothbrush the first time and I destroyed my gums.