I would go to another dentist. I have not heard of fixing something later when it sounds as if there is a problem with the tooth now. If there was any trauma to the tooth it could cause the tooth big problems later on. She may not be feeling pain now, but it should be checked. Also, bleaching can cause severe sensitivity to teeth - especially if there is something underlying going on. How do you know the dentist trays will not work? Although it did not work for me. They say the laser works best and is an hour procedure - best to get all done so they are the same color. \
I wish your daughter and you the best.
A quitter never wins, and a winner never quits.