I was skeptical when I saw an ad about SNOW in the internet but I still decided to give it a try after reading some reviews. I could see the difference within 2 days. I received the kit 4/2/2022 and by 4/4/2022 I can see a difference. My teeth got about 1-2 shades whiter. My family members started noticing the difference and asked if I had gone to whiten my teeth sooooo I told them about it and now 2 of my siblings have purchase SNOW as well. No sensitivity to my teeth which was a big plus for me. I don't use product every day maybe every other day or every 2 days. Since buying SNOW my teeth went from shade 5-6 to now shade 2-3 big improvement. I do want to add that product comes with expiration day my had one expiration day in the outside and a different one in the inside so I don't know which is the actual expiration date.