Many people feel as if they need coffee to get their day going. You may be one of these people, but have you ever thought what coffee does to your teeth? Coffee may taste delicious and gives you a jolt of energy, but ultimately, it stains your teeth. Tannins are astringents or biomolecules found in coffee, wine, and tea. They cause the coloring of these beverages to stick to your teeth. Unfortunately, coffee lovers, they leave behind a yellow residue. Just one cup a day will stain your teeth! If you want to learn more about how coffee affects your teeth, keep reading.