Foods and drinks are a big cause for tooth discoloration. People that drink tea, coffee, or wine often have tooth discoloration. Cigarettes, cigars, and chewing tobacco also all have ingredients that stick to the teeth and create a stained or dark appearance.
Poor dental hygiene is also another large contributing factor to tooth discoloration. It’s important to always brush, floss, and rinse enough to remove plaque and bits of leftover food or other substances.