As someone who never took my teeth and overall oral health serious until recently, this shocked me. I have used Crest white strips which work great too but these are the BEST if you have sensitive teeth. Crest products cause stinging in my teeth after use and cause them to be very sensitive. These are way too adhesive too. The last 3 days of the 7 day supply of strips I used the Teeth Whitening Dual Barrel Oxyburst Mouthwash as well and I think those together are great for whiting. Photos really don’t do justice but I’d say it is as least 3 shades whiter. I am starting my wireless kit today! Amazing product!