Professional teeth whitening uses a bleaching gel, containing ingredients like hydrogen peroxide or carbamide peroxide. These agents break down and release oxygen molecules that penetrate the tooth enamel to break up stains, making the teeth whiter.

 Yes, when performed by a dental professional, the procedure is safe. The dentist can monitor the process and take precautions to protect your gums and other soft tissues from the bleaching gel, which helps to minimize potential side effects like temporary tooth sensitivity.

 The results of teeth whitening are not permanent. The effect can last for several months to a few years, but this depends on your diet and lifestyle habits, such as consuming foods and drinks that stain. You may need to repeat the procedure or use a take-home kit for maintenance.

While over-the-counter kits can offer some results, professional treatments are often more effective because they use higher concentrations of bleaching agents. Kits provided by a dentist, including custom-made trays, are also more precise and safer for your gums.