I have been using crest white strips this is about my 5th day. This morning before I put them on I forgot and brushed my teeth. Immediately after brushing my teeth, I put on the white strips. I had them on for about 15 minutes before I had to take them off because they were burning my teeth and gums so bad. When I took them off, I found that on the top of one of my front teeth around my gum was white looking. Also, this same thing happened at the bottom of one of my bottom teeth. What could have caused this? Can pregnancy affect this?
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