I used teeth whitening gel and before putting the trays in mouth overnight as dentist suggested, he also gave me KOR desensitizer, I've had blisters and a swollen lower lip which is painful, appears to be getting worse. Dentist told me to use sensodyne toothpaste, get it foamy then put trays over it, made it worse. I am on a ship at sea and don't know whether the gel leaked out or the desensitizer caused it. I just want to do something to get rid of the blisters, reduce the swelling, it's too painful to eat or drink or brush teeth. Can you help?