Extending the time off gels or rinses in the mouth will not improve the affectivity of the products. After each treatment do not drink carbonated beverages for at least two hours to get better results and protect the teeth. Teeth whitening products are very affordable that customers sometimes overdo the practice that more may be better. First, the tooth enamel is a highly mineralized very hard part of the tooth composed of strand of rod-like crystalline materials. These rods while very tightly packed have microscopic gaps in between them. The density of the crystalline rods differs from individual to individual and explains the reason why some tooth enamel are tougher than another person's enamel. When the stains are not effectively removed and stays on the teeth for a period of time, this could penetrate deeper into the dentin which could require more involved methods. Those stains that form beneath the enamel are intrinsic stains. Previously, intrinsic stains are believed to be resistant to treatments although today most of it could be removed with close supervision from qualified professionals. Another reason for its popular use is that while the strips are thin, usual bleaching trays are bulky that could aggravate jaw problems, trigger gag reflex and messier to wear and remove. These differences allow a person to do much of the normal activities with less interference. Still like most everything, there is a downside to teeth whitening strips. And everyone can even increase the chance of being in the safe side if they can shop for the whitening tooth paste that is approved by the American Dental Association. And if you are one of those who will try this product for the first time due to its efficacy and safety, there are some things to note and to remember. And these products will always contain chemicals. And it is the role of these chemicals to break down the stains taken down by the abrasives. Half of the reason why this product works can be linked to the proper use and application. It is recommended by oral health practitioners that this should be used twice a day.