Post by sizzling07 on Dec 1, 2011 6:19:57 GMT -5
It is not entirely clear what causes this sensitivity in over two-thirds of people who use either at-home whitening methods or get professional whitening at the dentist. However, it is believed to occur when the peroxide used for bleaching comes into contact with the nerve tissue inside the tooth. Nearly all tooth whitening systems use peroxide as the active bleaching ingredient, which leads to temporarily sore teeth or sore gums.