Your teeth have tons of tiny pores. Coffee, wine, tobacco, and the foods we eat (such as dark berries and such) travel into these pores and cause your teeth to stain well below the surface of your enamel. Over time, these stains worsen and the discoloration becomes more evident.
It is completely natural to experience this type of tooth staining – it’s actually unavoidable if your diet contains any of the above mentioned food or drinks. These stains will not go away, either, unless you do something about it.
Stainchanging Tip #1: Use a metal straw when drinking coffee or wine! This will keep your teeth away from direct contact with the coffee/wine when you’re taking a sip. This will reduce the exposure time between your teeth and these tooth stainers!