32 A normal dental exam, commencing using a health and dental history, may well consist of questions on the affected individual’s perception of the cause of the dental discoloration, and also allergies (which may contain components in bleaching supplies), and any previous or recent background of tooth sensitivity.32, 33 LEDs https://familyportraitphotography99536.targetblogs.com/23212138/led-teeth-whitening-an-overview