Though there aren't any major health risks for this kind of professional in-office whitening, according to New York-based dentist Dr. Michael Apa
, D.D.S., of Apa Rosenthal Group, there is a heightened chance of sensitivity. "It often utilizes a higher percentage of peroxide called carbamide peroxide than those found in at-home treatments, which can potentially cause temporary post-operative tooth sensitivity," Apa says. "You can minimize the downtime by taking a few steps at home after the procedure is completed, including using fluoridated products (e.g. toothpaste and mouthwash)."