Q. I bought a tooth whitening kit from a private dental surgery and explained that I had very sensitive teeth beforehand. He checked my teeth and said they would be fine and that I should purchase Tooth mousse. I used it once and haven’t been able to use it again as I was in agony. No amount of sensitive toothpaste helped. I really want them whitening but can’t suffer that for 2 weeks. My own dentist tells me that due to prolonged smoking, I have a mild case of gum recession and possibly my nerves may be exposed. How can I whiten them without the pain? I bought daywhite. 2hours was too long and it should have been on longer. Help, I have stopped smiling because of the colour of my teeth, although my dentist says they are still very healthy.