Is it really OK to leave Crest Whitestrips on for longer than 30 minutes?!

Is it really OK to leave Crest Whitestrips on for longer than 30 minutes?

I accidently fell asleep for 4 hours with them on. I took them off and went back to sleep. When i woke up 4 hours later, I felt this nasty pain in my gums. I still feel the pain right now. It feels like my teeth is about to fall off.

I really don't think it is ok to leave them on for such an extended period. Dr. Oz was on Oprah a couple months ago and said that whitening improperly can corrode your teeth, and eat away at your gums. You may want to visit a dentist just for an exam, to make sure nothing is damaged.

I just finished my 14th day of the strips and I found it best to use them as soon as I woke up and brushed my teeth. You might want to try that kind of schedule if you're an easy-dozer.