Our teeth changes color because the internal portion of our teeth normally darkens over time. What we eat, drink and smoke can also contribute to the change of color. Our teeth can get stained from smoking, drinking dark coffee, teas and wine. Certain medications can also cause the color of your teeth to change. That is why it is important to regular visit your dentist and get regular cleaning cause it can help. That is why tooth cleaning is covered under all dental insurance plan as a preventive measure.