The most common concern is temporary teeth sensitivity, but lots of advances have been made in recent years to help combat this. Philips ZOOM!® WhiteSpeed has adjustable intensity settings to help maximize patient comfort, and 99% of patients experience little to no sensitivity. Also, Philips ZOOM!® DayWhite and NiteWhite have a special formula with built-in potassium nitrate and ACP (amorphous calcium phosphate), which are known desensitizers. These special ingredients make your enamel smoother and more lustrous as well. We highly recommend that you brush with a sensitivity formula toothpaste like Fluoridex™ Daily Defense Sensitivity Relief for two weeks prior to whitening, and that you take ibuprofen on the day of your treatment.