The answer is both yes and no. Yes, if you use them the way they are supposed to be used, and no, if you use them in excess or don't follow the instructions or if you purchase from a non-reputable whitening brand. The ingredients used in teeth whitening are known to be safe, if used in proper quantities and in the right amount of time.
But, using these same products without proper supervision from a professional dentist can cause some people unnecessary harm. It's therefore always advisable that teeth whitening products be used under proper supervision from professionals. Failure to see a dentist or consider your overall oral health can create side effects such as heightened sensitivity.
With over a decade of accumulated data to support its position, the American Dental Association (ADA) has come to the conclusion that teeth whitening products with hydrogen peroxide or carbamide peroxide are safe.
Read the ADA’s official position on teeth whitening on the ADA website.
Read our article about teeth whitening dangers here.
View reviews on teeth whitening products here.