i kept the bleaching trays in for only a few hours and noticed a super white spot on one of my front teeth...not good...the more i bleached, the whiter it became...when i asked the dentist about it, he said it happens pretty often...it's some sort of calcium thing...anyway...i stopped bleaching because the white spot was more noticable than my teeth being just normal...
he also said they don't know what causes it and there's nothing you can do...there is no way of knowing if you will or will not have this problem...it's been awhile now, and it's started to fade and blend back in now.. i'm afraid to try it again...for fear of ending up with a spotted smile...i can always tell now when people are bleaching their teeth because of the spots...
