We all know that prevention is the best medicine for illnesses, but this also applies to the state of your teeth. Apart from practicing proper oral hygiene, the most effective way to maintain a bright smile is to avoid or limit staining substances. You are probably familiar with many of the most common culprits, however some may surprise you. Knowing what can cause yellow teeth and other types of discolouration is the first step, so read on if you want to protect your precious pearly whites.