Tooth whitening is a popular method for improving the appearance of discolored teeth. The wide range of techniques available—in‐office whitening, dentist‐supervised at‐home whitening, and over‐the‐counter whitening—reflects its popularity. The efficacy and side effects are dependent on the technique, with tooth sensitivity being the most commonly reported side effect associated with all of the approaches. Sensitivity issues related to at‐home whitening have been reviewed in previous appraisals (Swift, JERD 2006; 18:225–8 and 301–5). Therefore, the current Critical Appraisal focuses on the incidence of sensitivity, pulpal responses, and prevention of sensitivity during in‐office whitening treatments.