Zoom teeth whitening is the process of eliminating stubborn tooth discoloration from your smile. It begins with your dentist protecting your gums with a rubber shield. Then he paints the whitening gel onto the front surfaces of your teeth. When your smile is covered, he will activate the solution with a special ultraviolet light. This will make the whitening chemicals penetrate your teeth and break up the stains. Your dentist will repeat these steps to provide the best results possible.