Tooth sensitivity is a relatively common side effect of teeth whitening. No harm is caused to your tooth as a result of a whitening treatment, and this discomfort is not an indication of damage to your tooth. If sensitivity occurs, it is most often temporary and will go away when you’ve completed the whitening process. If you do experience tooth sensitivity, there are ways to treat it using desensitizing toothpastes and gels such as Opalescence Whitening Toothpaste Sensitivity Relief or UltraEZ desensitizing gel. Consult with your dentist to determine the best treatment for your needs.