Very dissatisfied with this service. I had purchased it with Groupon, and even paid for the double treatment. I see more spotting than before I came in for my appointment. After saying I had more spotting, the technician replied by saying "don't be fussy". Excuse me, these are my teeth, that's exactly why I am concerned. I would not recommend this place, even if you get it with Groupon at a lesser amount. Now have to find a dentist to fix what they have done.