Tooth whitening is nice to have and while it delivers many oral health benefits, it is not for everybody. Your teeth and gums need to be in a healthy state before starting any whitening procedure. Tooth whitening does not change the colour of decay, filings, veneers, crowns or bridges so If your teeth are heavily restored or have become badly damaged or decayed tooth whitening my not be for you. Your dentist or hygienist will be best placed to examine the state of your teeth and give you any recommendations.
Any surgical or invasive procedure carries risks. Before proceeding, you should seek a second opinion from an appropriately qualified health practitioner.