I used teeth whitening gel and before putting the trays in mouth overnight as dentist suggested, he also gave me KOR desensitizer, Ive 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 dont 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, its too painful to eat or drink or brush teeth.  Can you help?
Hello, You have symptoms of blisters and swollen lower lips after using teeth whitening gel which is mainly because of allergic reaction and chemical burn due to ingredients of these agents. I would suggest you maintain HY Chat Doctor.