The key to whiter teeth thougyh is the delivery system. Whitening products are usually a gel or paint like product placed on your teeth. The tooth bleaching gel or teeth whitening gel is held in place by a delivery system. The delivery system is how the teeth whitening product is held in place next to your teeth. Usually this is a tray or molded plastic impression of your teeth. The key to getting good results is that the gel or pain product with the tooth whitening agent must stay in contact with your teeth surface. Simply putting it on and having it wash away will not work. Some of the less effective delivery methods are the strip type.

Crest white strips are very popular. These are simply a tooth bleaching tape that's placed on the front teeth only. Crest whitestrips use a delivery system that's a lot like a piece of flexible tape. The tape is placed on the front teeth and contains tooth bleaching gel. It's easy and simple to use. Remember that although the whitening strips may only cover the front teeth, they're usually more comfortable.

The more complete and better delivery method is a tray similar to those teeth protectors used by athletes. In the cheaper teeth whitening kits, the trays provided are heated in hot water then placed in the mouth to form an adequate, if not perfect fit. The better the fit, the better the teeth whitener gel will stay in contact with your teeth.

What I consider to be the best long term value however is a custom tray made just for your teeth. Higher quality teeth whitening kits provide a material to take an impression of your teeth. Because the impression fits exactly to your teeth, it's more comfortable and allows the whitening product to cover all the teeth surfaces. The one negative to using a custom tray is the short delay while the impression is sent to the dental lab to make the custom tray to fit your mouth. This just takes an extra couple of days but the results are very much worth it to say nothing of the much more comfortable tray.

The good news is that most custom tray teeth whitening kits provide everything needed for the best, most economical teeth whitening results. Custom trays last a long time and give great results at an affordable price.