Teeth whitening have become so popular that it seems like everyone is doing it. If you want to obtain a bright and white smile, teeth whitening may be just what you are looking for. Not only is teeth whitening effective, it can also drastically change your smile and improve your self-esteem at the same time. Before you consider undergoing a teeth whitening procedure, it is a good idea to understand what causes yellow teeth in the first place. There are many factors that affect the color of your teeth. These teeth whitening techniques and methods are intended to boost the luster of one’s teeth. Years of smoking, drinking coffee, tea and colas, and even eating highly pigmented foods can wreak havoc on your teeth, turning them dingy and yellow. Even if you are careful to brush your teeth after every meal, aging will cause your teeth to grow dull.