GO GET ICON NOW! THIS PRODUCT IS AMAZING. I have had white spots for a while. and some days I can't even look at my teeth. I just got my braces off a couple weeks ago, and it's back to my normally white spotted teeth. So my orth recommended icon and you have to scred. another app. but it's worth. it...no pain, no needles. It might look like a needle..and it's like a syringe. You don't feel anything and my 4 teeth that they had done was like solid white 99.9% when I was done..