This gel in question contains peroxide in just the right quantity that can ensure that the teeth will whiten. And since this is the laser whitening procedure, expect that light will be used as well and this is used to activate the gel. The whole procedure will go on for an hour and could whiten the teeth by as much as 10 shades. It gets into the spaces of the rods in the enamel of the tooth, lifts the stains and drains the stain out. Several repetitions of this and the teeth become as white as its original color. Since over the counter teeth whitening trays are milder, it would take longer and more treatments but it would also prevent gum irritation and tooth sensitivity. Design differences for the mouthpiece trays. The mouthpiece trays that are available for supervised whitening sessions are considered as more reliable as compared to the ones that are available over the counter. The basis for this is simple. At least with the dentist-supervised procedures, the dentist can visit the person's home and can customize the site of the mouthpiece tray. For sure not you and your group of friends; often a white teeth is not only for selfish and personal reasons. Everyone will agree that this can also help in social and professional relationships. So you cannot really fault those people who rush into having these procedures. And if you are rushing into having your own sessions with your favorite dentist or you know someone who is planning to, it's best to hit the brakes first. Even if you do not have these issues, you may still need a mouth exam and an assessment of your gums. Your dentist is also in the best position to seek advice regarding over-the-counter system that could be used. Remember that teeth darken with age and there are 16 teeth shades and the color differs from one person to another. These are the whitening formulations that are carried by supermarkets and drug stores. Listed below are some of the top over-the-counter solutions that you can choose for your issues with regards to your teeth. Whitening strips and gels Gels are popular solutions for teeth whitening. These are clear gels that contain a good concentration of peroxide- that main ingredient that facilitates teeth whitening.