When you have the Vaseline or jelly spread throughout your mouth, and your mouth has adequate protection from the laser, it is time to put the teeth whitening gel on your teeth. The gel that will be placed on your teeth is a gel that contains hydrogen peroxide, and it will be put directly on your teeth.
The gel is put in a tray, and the tray is placed on your teeth. The dentist or provider should pay extra attention to placing the tray, as no gel should come into contact with the patient's gums; hydrogen peroxide will burn and damage the gums. This is sometimes unavoidable, but the damage can be lessened if close attention is paid. The patient will almost always experience at least a little sensitivity during the procedure and for a day immediately following the procedure.