Crest 3D Whitestrips Teeth Whitening Strips

This is only 6 days of use, each day the strips were on for 60 minutes. One of those days I didn’t brush off the residue and the next morning my teeth were sensitive to everything and aching terribly! I still applied the strips, then after 60 minutes I thoroughly washed the residue off with warm water only and the next few days I was fine. On the 6th night I applied for 60 minutes and washed the residue off like I had before, the next morning my bottom teeth were sensitive and aching. I didn’t do the 7th day, and as of 12/2/25 this would be my 8th day. I’m not sure if I personally can do continuous 20 days straight, since my teeth were so sensitive after using this product. It works pretty well however and I know continuous use would make your smile very bright!