You are not the only one with a yellow smile. A recent survey showed that over 80% of Americans aged 18-49 want whiter teeth. Yellow teeth occur due to a variety of causes that make the natural whiteness of teeth enamel fade and become discolored. Factors such as smoking, drinking too much coffee, or simply the effects of aging all lead to the ugly yellow color that so many people are trying so hard to get rid of. Because the yellow color is actually a stain, it can be very hard to fight. Until now.