People love to show of their pearly whites when they smile, but sometimes those pearly whites are not so white. There are many people who suffer from discoloration of their teeth and it can be a frustrating problem to deal with. Fortunately, there are treatment options available to treat tooth discoloration, but first one must understand what is causing that problem. Some of the most common causes include: improper dental hygiene, certain foods and drinks, genetics, smoking, certain medications, and age.