If the product is used incorrectly (too much), you may also have sensitive gums as a result of the excess product.
If you're experiencing something more than sensitivity, you should see your dentist.
A Answers (2)
Transient temperature sensitivity is a common side effect of teeth whitening. Depending on the system of bleaching used, and the strength of the bleaching agent, you may be more or less sensitive. Most bleaching solutions have desensitizing agents in them to help with this side effect.