Large bodies of research on teeth whitening have been conducted and have determined that peroxide in low concentrations is safe when used as directed. This includes being administered by an experienced professional. However, tooth sensitivity can be a common but temporary side effect of teeth whitening. A dentist will ensure that your gums and teeth are healthy enough for the procedure, and will take the necessary measures to ensure that your gums and teeth are protected during a teeth whitening procedure.
Tim Silegy, DDS