I have quite sensitive teeth. I cannot do the at home whitening strip treatments for the recommended time (30 mins) as my teeth hurt about 10 mins after having them on. Today I went to the dentist to get in chair whitening and they prepped everything (gums, gel, neurofen etc) and then they put the whitening gel on. As soon as the light was turned on I INSTANTLY felt the sensitivity and pain. Is there something wrong with my teeth?