What causes blisters and swollen lower lips after using teeth whitening gel?
Patient: 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? Doctor: 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 hydration level by drinking plenty of water. Apply petroleum jelly on lips to prevent them from drying. Drink plenty of water. Apply olive and coconut oils or essential oils on your lips to improve your symptoms. If symptoms keep on persisting visit oral physician once and get it examined and start treatment as per diagnosis. Hope I have answered your query. Let me know if I can assist you further.Regards, Dr. Harry Maheshwari