It recently happened to me. last week I purchased a box of Crest vived whitening strips. The next day I put on the first strip both upper and lower strips. left them on for 30 minutes as stated and when I took them off looked in my mirror an noticed a long vertical crack in both my front teeth. I was shocked to say the least. It wasn't a stain but a clear crack that I never saw before. I take good care of my teeth and just wanted to whiten them. I have healthy strong teeth and now they are cracked. I really want to sew these guys. How the heck can they crack your enamel. When I run my tounge agains my teeth I notice the crack lines. I have never felt that before and always have been particular about my teeth and keeping them healthy. How do I seal up this crack so it doesn't get worse and become smooth again.
Thank you,
From a very upset and pissed off used of whiting strips