There are many reasons why teeth may become yellow over time. Here are some of the most common causes: plaque build-up, smoking, and consuming foods and drinks that stain teeth. If you're concerned about the appearance of your teeth, there are various ways to achieve brighter and whiter teeth. One option is to visit a dentist for professional whitening treatments. However, there are also some at-home remedies that you can try. Keep reading to learn more about how to get white teeth.