i was soo excited to try this product. yet, im not happy with this product. I've always taken care of my teeth all my life. I now have been on my third treatment and a very minimal progress. In addition, i can't walk around without my phone hooked up to this device because it slips out of my mouth. i have to hold the brightener Can't multitask. When i got similar whiteners from my dentist i could sleep with the whitener and wake up with much brighter teeth. Friends have always said that my teeth were blinding. I did a lot of reviews. it might have worked for u, but unfortunately but not for me.